Physics 236 Worksheet: Chapter 26, Potential and Capacitance

1.     Potential energy per unit charge is called:

a.     electric force

b.      electric field

c.      electric potential

d.     electric charge

2.     The potential 10 cm from a point charge is +60 v. At a distance of 20 cm the potential is:

a.     120 v

b.      240 v

c.      30 v

d.     15 v

3.     When a charged particle moves in an opposite direction to the force of the electric field

a.     it must gain potential energy.

b.      it must lose potential energy.

c.      it must speed up.

d.     it must slow down.

4.     Farad is the unit of

a.     capacitance

b.      potential

c.      electric field

d.     electric charge

5.     In the figure point B is midway between +q and -q

 

 

 

a.     The potential at point A is (positive, negative, zero)? _________.

b.      The potential at point B is (positive, negative, zero)? _________.

c.      The potential at point C is (positive, negative, zero)? _________.

6.     Capacitors in series have the same

a.     energy.

b.      voltage.

c.      charge.

d.     capacitance.

7.     The effect of a dielectric material between the plates of a capacitor is to

a.     decrease the capacitance.

b.      increase the capacitance.

c.      reduce the dielectric strength.

8.     Doubling the voltage on a capacitor causes the stored energy to

a.     double.

b.      be cut in half.

c.      increase by a factor of four.

d.     be reduced by a factor of four.

 

Ans: 1-c, 2-c, 3-a, 4-a, 5a) positive, 5b) zero, 5c) negative, 6-c, 7-b, 8-c