(Multiple choice)

(1)

If the voltage across a parallel-plate capacitor is doubled, its capacitance 

(a) Doubles. 

(b) Drops by half. 

(c) Remains the same.

(2)

If the charge on an isolated spherical conductor is doubled, its capacitance 

(a) Doubles. 

(b) Drops by half. 

(c) Remains the same.

(3) True or false: 

The electrostatic energy per unit volume at some point is proportional to the square of the electric field at that point.

(4)

A parallel-plate air capacitor is connected to a constant-voltage battery. If the separation between the capacitor plates is doubled while the capacitor remains connected to the battery, the energy stored in the capacitor 

(a) Quadruples. 

(b) Doubles. 

(c) Remains unchanged. 

(d) Drops to half its previous value. 

(e) Drops to one-fourth its previous value.

(5)

If the capacitor of Problem 15 is from the battery before the separation between the plates is doubled, the energy stored in the capacitor upon separation of the plates 

(a) Quadruples. 

(b) Doubles. 

(c) Remains unchanged. 

(d) Drops to half its previous value. 

(e) Drops to one-fourth its previous value.