[Chongqing Guangdong education] Shandong University College Physics reference materials

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- College Physics - Electromagnetics and optics - Chapter materials, examination materials - Shandong University 【】
1.1 Charge and Coulomb's law In class testing
1、【 Multiple choice 】 The following statement is correct （ ）
A、 Charge is a relativistic invariant
B、 The charge is quantized
C、 Coulomb force satisfies the principle of linear superposition , The existence of a third party will change the interaction between the two
D、 The charge of any isolated system satisfies the law of charge conservation
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1.2 Electric field and electric field strength In class testing
1、【 Judgment questions 】 Any point charge can be used as a trial charge .
A、 correct
B、 error
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2、【 Judgment questions 】 The direction of the electric field intensity at a point , It can be determined by the direction of the electric field force on the negative charge at this point .
A、 correct
B、 error
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1.3 Gauss theorem In class testing
1、【 Single topic selection 】 The following statement is correct （ ）
A、 When the electric field intensity of each point on the closed surface is zero , There must be no charge in the surface
B、 When the electric field intensity of each point on the closed surface is zero , The algebraic sum of charges in a surface must be zero
C、 When the electric flux of the closed surface is zero , The electric field intensity at each point on the surface must be zero
D、 When the electric flux of the closed surface is not zero , The electric field intensity at any point on the surface cannot be zero
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The first week Unit tests
1、【 Single topic selection 】 Charge a point q In the center of a cube , Then the electric flux passing through one face of the cube is （ ）
A、‍
B、
C、
D、
E、
F、
G、
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2、【 Single topic selection 】
A、0
B、
C、
D、
E、
F、
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3、【 Single topic selection 】 Point charge Q By the surface S Surrounded by , Introduce another point charge from infinity q To a point outside the surface , Before and after , The following statement is correct （ ）
A、 Surfaces S The electric flux of the is constant , The change of field strength at each point on the surface .
B、 Surfaces S The electric flux of the is constant , The field strength of each point on the surface remains unchanged .‍
C、 Surfaces S Change of electric flux , The field strength of each point on the surface remains unchanged .
D、 Surfaces S Change of electric flux , The change of field strength at each point on the surface .
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4、【 Multiple choice 】 About power lines , The following statement is correct （ ）‍
A、 The density of the power line can reflect the intensity of the electric field
B、 The tangent direction of any point of the power line is the field strength direction at that point
C、 Power lines are real curves
D、 In the field produced by negative point charge , The tangent direction of each point on the electric field line is opposite to the direction of the field strength at that point
E、 The power line will be interrupted when there is no charge
F、 Power lines are from positive charge to negative charge
G、 Where there is no charge , The two power lines will not intersect
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5、【 Multiple choice 】 The following statement is not true （ ）
A、 When the electric flux of the closed surface is zero , The electric field intensity at each point on the surface must be zero
B、 When the electric flux of the closed surface is zero , The electric field intensity at each point on the surface must be zero
C、 When the electric flux of the closed surface is not zero , The electric field intensity at any point on the surface cannot be zero
D、 The electric field intensity on a closed surface is the total electric field intensity of all charges in the surface
E、 The total charge in the closed surface is 0, The field strength of each point on the surface is 0
F、 When the electric field intensity of each point on the closed surface is zero , The algebraic sum of charges in a surface must be zero
G、 When the electric flux passing through the closed surface is zero , The algebraic sum of charges in a surface must be zero
H、 Only the charge in the closed surface contributes to the electric flux passing through the surface
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6、【 Judgment questions 】 The direction of the electric field intensity at a point , It can be determined by the direction of the electric field force on the negative charge at this point .
A、 correct
B、 error
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7、【 Judgment questions 】 Gauss theorem is only applicable to electrostatic field problems where charge distribution satisfies certain symmetry
A、 correct
B、 error
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8、【 Judgment questions 】 With the development of science and technology , future “ The charge is quantized ” This theory may be overturned .
A、 correct
B、 error
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9、【 Judgment questions 】 When the trial charge is placed in different positions in the electric field , The magnitude and direction of the electric field force may be the same .
A、 correct
B、 error
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10、【 Judgment questions 】 We can judge whether there is an electric field at a certain point by probing the charge .
A、 correct
B、 error
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1.4 Electric potential and its relationship with electric field strength In class testing
1、【 Single topic selection 】 The following statement is correct （ ）
A、 The point where the electric field intensity is zero , The potential must also be zero
B、 The intensity of the electric field is not zero , The potential must not be zero
C、 The point where the potential is zero , The electric field strength must also be zero
D、 The potential is constant in a certain region , Then the electric field intensity must be zero in this region
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1.5 A metal conductor in an electrostatic field In class testing
1、【 Multiple choice 】 For isolated conductors , The following statement is correct （ ）
A、 The charge distribution on the conductor surface is related to the shape of the conductor itself
B、 If the radius of curvature somewhere on the conductor surface is large , Then the area density of charge is also large
C、 If the surface of the conductor is flat somewhere , Then the area density of charge is small
D、 The surface density of charge in the concave part of the conductor surface is very small
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1.6 Capacitors and capacitors In class testing
1、【 Judgment questions 】 Capacitance of isolated conductor , It can reflect the ability of isolated conductors to store charge and electric energy .
A、 correct
B、 error
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2、【 Judgment questions 】 Without changing other conditions , Reduce the distance between two plates of parallel plate capacitor , It can increase the capacitance of parallel plate capacitor .
A、 correct
B、 error
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1.7 Dielectric In Electrostatic Field In class testing
1、【 Multiple choice 】 According to Gauss theorem in dielectric , In a dielectric, the integral of the electric displacement vector along any closed surface is equal to the algebraic sum of the free charges surrounded by the surface , Then the following inference is incorrect （ ）
A、 If the integral of the potential displacement vector along any closed surface is zero , Then there must be no free charge in the surface
B、 If the integral of the potential displacement vector along any closed surface is zero , Then the algebraic sum of charges in the surface must be equal to zero
C、 If the integral of the potential displacement vector along any closed surface is not zero , Then there must be a polarized charge in the surface
D、 Gauss theorem in medium shows that the potential shift vector is only related to the distribution of free charge
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1.8 The energy of electrostatic field In class testing
1、【 Judgment questions 】 The energy of the electrostatic field is localized to the electrostatic field , As long as there is space for an electric field , It has electric field energy .
A、 correct
B、 error
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2、【 Judgment questions 】 When a charged body moves in an electric field , The electric field force does no work on the charged body , It shows that the electric field has no energy .
A、 correct
B、 error
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Chapter one Homework
In the second week of Unit tests
1、【 Single topic selection 】 When a charged conductor reaches electrostatic equilibrium , The following statement is correct （ ）
A、 The potential difference between any point inside the conductor and any point on its surface is equal to zero
B、 The potential is higher where the charge density is higher on the surface
C、 The potential is higher where the surface curvature is larger
D、 The potential at any point inside the conductor and at any point on its surface is equal to zero
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2、【 Single topic selection 】 The following statement is correct （ ）
A、 When a neutral conductor approaches another negatively charged conductor , The potential of the former decreases , The latter potential increases
B、 Due to electrostatic balance , The conductor must be equipotential
C、 Due to electrostatic induction , Different charges appear in different areas of the conductor surface , Therefore, the conductor is no longer an equipotential body
D、 The electric field intensity generated by the charged body in the conductor cavity outside the cavity is zero
E、 All grounding conductors , Its surface must be free of charge everywhere
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3、【 Single topic selection 】 The value of the potential at a certain point in the electrostatic field is equal to （ ）
A、 The electric potential energy of a unit positive charge placed at this point
B、 Test the electric potential energy when the charge is placed at this point
C、 The electric potential energy of a unit charge placed at this point
D、 Move the unit positive charge from this point to the potential zero , Work done by external force
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4、【 Single topic selection 】 Put a positively charged body A Move from a distance to an uncharged conductor B near , Then conductor B The potential of will （ ）
A、 elevated
B、 Reduce
C、 No change
D、 Undetermined
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5、【 Single topic selection 】 The electric potential of a certain point in the electrostatic field , What is correct in the following statement is （ ）
A、 The positive and negative of potential value depends on the selection of potential zero point
B、 The positive and negative of the potential value depends on the positive and negative of the trial charge placed at this point
C、 The positive and negative of the potential value depends on the positive and negative work done by the electric field force on the test charge
D、 The positive and negative of the potential value depends on the positive and negative of the charge generating the electric field
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6、【 Multiple choice 】 Which of the following statements is not true （ ）
A、 The work done by electrostatic field force is related to the path
B、 Electric field force does not do work , Then the charge must move along the equipotential surface
C、 The farther away from the charge, the lower the potential
D、 Electrostatic field is a conservative field
E、 Electrostatic field force is a conservative force
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7、【 Multiple choice 】 The following statement is not true （ ）
A、 The point where the electric field intensity is zero , The potential must also be zero
B、 The intensity of the electric field is not zero , The potential must not be zero ‍
C、 The point where the potential is zero , The electric field strength must also be zero
D、 The potential is constant in a certain region , Then the electric field intensity must be zero in this region .
E、 Where the electric field intensity is zero , The potential may not be zero .
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8、【 Multiple choice 】 The following statement is not true （ ）
A、 The potential at the place with the greatest electric field strength must also be the largest
B、 The potential must be the same where the electric field strength is the same
C、 The magnitude of the electric field intensity at the maximum potential must also be the largest
D、 The electric field strength at the same potential must also be the same
E、 The potential at zero electric field strength must also be zero
F、 The electric field strength at the zero potential must also be zero
G、 Where the electric field strength is large, the electric potential is not necessarily large
H、 The electric field strength is not necessarily large where the potential is large
I、 The potential is not necessarily zero when the electric field strength is zero
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9、【 Judgment questions 】 For the point of charge generation , The closer to the point charge , The greater the potential .
A、 correct
B、 error
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10、【 Judgment questions 】 The capacitance of an isolated conductor depends only on the size and shape of the conductor itself , It has nothing to do with the charge and potential .
A、 correct
B、 error
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11、【 Judgment questions 】 For polar molecules , When placed in an electrostatic field , Only directional polarization occurs .
A、 correct
B、 error
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12、【 Judgment questions 】 Polarized charges can only appear on the surface of a dielectric .
A、 correct
B、 error
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2.1 Constant current condition and conduction law In class testing
1、【 Judgment questions 】 Because the direction of current intensity is the same as that of current density , And the current density is a vector , Both size and direction , Therefore, the current intensity also has size and direction , So the current intensity is also a vector .
A、 correct
B、 error
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2.2 Magnetic field and magnetic induction In class testing
1、【 Judgment questions 】 When the magnetic induction line passes through the curved surface , The magnetic flux is negative ; When the magnetic induction line passes through the curved surface , The magnetic flux is positive .
A、 correct
B、 error
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2.3 Biot - Biot Savart's Law In class testing
1、【 Judgment questions 】 A magnetic field is a conservative field , There is a scalar potential function .
A、 correct
B、 error
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2.4 Gauss theorem of magnetic field and ampere loop theorem In class testing
1、【 Single topic selection 】
A、
B、
C、
D、
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The third week Unit tests
1、【 Single topic selection 】 The following statement is correct （ ）
A、 When the magnetic induction intensity of each point on the closed circuit is zero , The algebraic sum of the currents passing through the circuit must be zero
B、 When the integral of magnetic induction intensity along the closed loop is not zero , The algebraic sum of the current passing through the circuit must not be zero
C、 When the magnetic induction intensity of each point on the closed circuit is zero , There must be no current in the circuit
D、 When the integral of magnetic induction intensity along the closed loop is zero , The magnetic induction intensity at each point on the circuit must be zero
E、 When the integral of magnetic induction intensity along the closed loop is not zero , The magnetic induction intensity at any point on the circuit cannot be zero
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2、【 Single topic selection 】
A、
B、
C、
D、
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3、【 Judgment questions 】 In a constant current field, the current passing through any closed surface must be equal to zero . The current line of a constant current field must be a closed curve connected head to tail .
A、 correct
B、 error
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4、【 Judgment questions 】 When the magnetic induction line passes through the curved surface , The magnetic flux is positive ; When the magnetic induction line passes through the curved surface , The magnetic flux is negative .
A、 correct
B、 error
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5、【 Judgment questions 】 Ampere loop theorem , It is only applicable to the problem of stable magnetic field with certain symmetry of current distribution .
A、 correct
B、 error
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6、【 Judgment questions 】 The differential form of Ohm's law is only applicable to the case of constant current , Does not apply to changing current fields .
A、 correct
B、 error
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7、【 Judgment questions 】 Because the current intensity has both magnitude and direction , So the current intensity is a vector .
A、 correct
B、 error
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8、【 Judgment questions 】 The ampere loop theorem is not applicable to the steady magnetic field whose current distribution does not meet a certain symmetry .
A、 correct
B、 error
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9、【 Judgment questions 】 The flux of magnetic induction intensity to any surface is zero .
A、 correct
B、 error
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10、【 Judgment questions 】 A steady magnetic field is a conservative field , There is a corresponding scalar potential function .
A、 correct
B、 error
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