Question 1

When 5.0 C of charge moves at constant speed along a path between two points differing in potential by 12 V,the amount of work done is

Accepted Answer

A) 2.4 J 
B) 0.42 J 
C) 5.0 J 
D) 12 J 
E) 60 J 
A) 2.4 J 
B) 0.42 J 
C) 5.0 J 
D) 12 J 
E) 60 J

Question 2

A charge of 100 nC resides on the surface of a spherical shell of radius 20 cm.The electric potential at a distance of 15 cm from the center of the spherical shell is

Accepted Answer

A) 18 V 
B) 180 V 
C) 1800 V 
D) 18,000 V 
E) None of these is correct. 
A) 18 V 
B) 180 V 
C) 1800 V 
D) 18,000 V 
E) None of these is correct.

Question 3

Two parallel horizontal plates are spaced 0.40 cm apart in air.You introduce an oil droplet of mass 4.9 × 10-17 kg between the plates.If the droplet carries two electronic charges and if there were no air buoyancy,you could hold the droplet motionless between the plates if you kept the potential difference between them at

Accepted Answer

A) 60 V 
B) 12 V 
C) 3.0 V 
D) 0.12 kV 
E) 6.0 V 
A) 60 V 
B) 12 V 
C) 3.0 V 
D) 0.12 kV 
E) 6.0 V

Question 4

A conducting sphere of radius r1 = 10 cm and charge q1 = 2 F1F1F1S1F1F1F10C is placed far apart from a second conducting sphere of radius r2 = 30 cm and charge q2 = 3 F1F1F1S1F1F1F10C.The two spheres are then connected by a thin conducting wire.What is the potential on the surface of the first sphere after the two spheres are connected by the wire? Use the reference V = 0 for r at infinity.

Accepted Answer

A) 1.12 F1F1F1S1F1F1F10 105 V 
B) 1.80 F1F1F1S1F1F1F10 105 V 
C) 2.25 F1F1F1S1F1F1F10 105 V 
D) 2.70 F1F1F1S1F1F1F10 105 V 
E) none of the above 
A) 1.12 F1F1F1S1F1F1F10 105 V 
B) 1.80 F1F1F1S1F1F1F10 105 V 
C) 2.25 F1F1F1S1F1F1F10 105 V 
D) 2.70 F1F1F1S1F1F1F10 105 V 
E) none of the above

Question 5

The electric potential in a region of space is given by   The x-component of the electric field in this region is

Accepted Answer

A) (10 V/m)   
B) -(10 V/m)   
C) (20 V/m)   
D) -(20 V/m)   
E) -(30 V/m)   
A) (10 V/m)   
B) -(10 V/m)   
C) (20 V/m)   
D) -(20 V/m)   
E) -(30 V/m)

Question 6

A positive point charge of 10-4 C is located 3 m from another positive point charge of 10-5 C.Their mutual electric potential energy is

Accepted Answer

A) 3 J 
B) 2 J 
C) 1 J 
D) zero 
E) -1 J 
A) 3 J 
B) 2 J 
C) 1 J 
D) zero 
E) -1 J

Question 7

Use the following to answer the next question:  
-Which point in the electric field in the diagram is at the highest potential?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Exam 23: Electric Potential

When 5.0 C of charge moves at constant speed along a path between two points differing in potential by 12 V,the amount of work done is

A charge of 100 nC resides on the surface of a spherical shell of radius 20 cm.The electric potential at a distance of 15 cm from the center of the spherical shell is

The electric potential in a region of space is given by The x-component of the electric field in this region is

A positive point charge of 10-4 C is located 3 m from another positive point charge of 10-5 C.Their mutual electric potential energy is

Use the following to answer the next question: -Which point in the electric field in the diagram is at the highest potential?

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A positive point charge of 10^-4 C is located 3 m from another positive point charge of 10^-5 C.Their mutual electric potential energy is