Question 1

The equipotential surfaces associated with a charged point particle are:

Accepted Answer

A) radially outward from the particle 
B) vertical planes 
C) horizontal planes 
D) concentric spheres centered at the particle 
E) concentric cylinders with the particle on the axis 
A) radially outward from the particle 
B) vertical planes 
C) horizontal planes 
D) concentric spheres centered at the particle 
E) concentric cylinders with the particle on the axis

Question 2

The potential difference between the ends of a 2-meter stick that is parallel to a uniform electric field is 400 V.The magnitude of the electric field is:

Accepted Answer

A) 0 V/m 
B) 100 V/m 
C) 200 V/m 
D) 400 V/m 
E) 800 V/m 
A) 0 V/m 
B) 100 V/m 
C) 200 V/m 
D) 400 V/m 
E) 800 V/m

Question 3

The diagram shows four pairs of large parallel conducting plates.The value of the electric potential is given for each plate.Rank the pairs according to the magnitude of the electric field between the plates, least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 2, 3, 1, 4 
D) 2, 4, 1, 3 
E) 3, 2, 4, 1 
A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 2, 3, 1, 4 
D) 2, 4, 1, 3 
E) 3, 2, 4, 1

Question 4

An electron goes from one equipotential surface to another along one of the four paths shown below.Rank the paths according to the work done by the electric field, from least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 1, then 3, then 4 and 2 tie 
D) 4 and 2 tie, then 3, then 1 
E) 4, 3, 1, 2 
A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 1, then 3, then 4 and 2 tie 
D) 4 and 2 tie, then 3, then 1 
E) 4, 3, 1, 2

Question 5

Positive charge is distributed uniformly throughout a non-conducting sphere.The highest electric potential occurs:

Accepted Answer

A) at the center 
B) at the surface 
C) halfway between the center and surface 
D) just outside the surface 
E) far from the sphere 
A) at the center 
B) at the surface 
C) halfway between the center and surface 
D) just outside the surface 
E) far from the sphere

Question 6

An electron has charge -e and mass me.A proton has charge e and mass 1840me.A "proton volt" is equal to:

Accepted Answer

A) 1eV 
B) 1840eV 
C) (1/1840)eV 
D) eV 
E) (1/)eV 
A) 1eV 
B) 1840eV 
C) (1/1840)eV 
D) eV 
E) (1/)eV

Question 7

If the electric field is in the positive x direction and has a magnitude given by E = Cx2, where C is a constant, then the electric potential is given by V =

Accepted Answer

A) 2Cx 
B) -2Cx 
C) Cx3/3 
D) -Cx3/3 
E) -3Cx3 
A) 2Cx 
B) -2Cx 
C) Cx3/3 
D) -Cx3/3 
E) -3Cx3

Question 8

A solid metal sphere carries a charge of 5 *10-9 C and is at a potential of 400 V, relative to the potential far away.The potential at the center of the sphere is:

Accepted Answer

A) 400 V 
B) -400 V 
C) 2 * 10-6 V 
D) 0 V 
E) none of these 
A) 400 V 
B) -400 V 
C) 2 * 10-6 V 
D) 0 V 
E) none of these

Question 9

Two conducting spheres are far apart.The smaller sphere carries a total charge of Q.The larger sphere has a radius that is twice that of the smaller and is neutral.After the two spheres are connected by a conducting wire, the charges on the smaller and larger spheres, respectively, are:

Accepted Answer

A) Q/2 and Q/2 
B) Q/3 and 2Q/3 
C) 2Q/3 and Q/3 
D) 0 and Q 
E) 2Q and -Q 
A) Q/2 and Q/2 
B) Q/3 and 2Q/3 
C) 2Q/3 and Q/3 
D) 0 and Q 
E) 2Q and -Q

Question 10

An electron moves from point i to point f, in the direction of a uniform electric field.During this motion:

Accepted Answer

A) the work done by the field is positive and the potential energy of the electron-field system increases 
B) the work done by the field is negative and the potential energy of the electron-field system increases 
C) the work done by the field is positive and the potential energy of the electron-field system decreases 
D) the work done by the field is negative and the potential energy of the electron-field system decreases 
E) the work done by the field is positive and the potential energy of the electron-field system does not change 
A) the work done by the field is positive and the potential energy of the electron-field system increases 
B) the work done by the field is negative and the potential energy of the electron-field system increases 
C) the work done by the field is positive and the potential energy of the electron-field system decreases 
D) the work done by the field is negative and the potential energy of the electron-field system decreases 
E) the work done by the field is positive and the potential energy of the electron-field system does not change

Exam 24: Electric Potential

The equipotential surfaces associated with a charged point particle are:

The potential difference between the ends of a 2-meter stick that is parallel to a uniform electric field is 400 V.The magnitude of the electric field is:

The diagram shows four pairs of large parallel conducting plates.The value of the electric potential is given for each plate.Rank the pairs according to the magnitude of the electric field between the plates, least to greatest.

An electron goes from one equipotential surface to another along one of the four paths shown below.Rank the paths according to the work done by the electric field, from least to greatest.

Positive charge is distributed uniformly throughout a non-conducting sphere.The highest electric potential occurs:

An electron has charge -e and mass me.A proton has charge e and mass 1840me.A "proton volt" is equal to:

If the electric field is in the positive x direction and has a magnitude given by E = Cx2, where C is a constant, then the electric potential is given by V =

A solid metal sphere carries a charge of 5 *10-9 C and is at a potential of 400 V, relative to the potential far away.The potential at the center of the sphere is:

Two conducting spheres are far apart.The smaller sphere carries a total charge of Q.The larger sphere has a radius that is twice that of the smaller and is neutral.After the two spheres are connected by a conducting wire, the charges on the smaller and larger spheres, respectively, are:

An electron moves from point i to point f, in the direction of a uniform electric field.During this motion:

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An electron has charge -e and mass m_e.A proton has charge e and mass 1840m_e.A "proton volt" is equal to:

If the electric field is in the positive x direction and has a magnitude given by E = Cx², where C is a constant, then the electric potential is given by V =

A solid metal sphere carries a charge of 5 *10^-9 C and is at a potential of 400 V, relative to the potential far away.The potential at the center of the sphere is: