1. A parallel-capacitor is connected to a battery. What happens to the stored energy if the plate separation is doubled while the capacitor remains connected to the battery?
(A) It remains the same
(B) It is doubled
(C) It decreases by a factor of 2
(D) I decreases by a factor of 4
(E) It increases by a factor of 4
2. A medical defibrillator stores 1000 J of energy in a 100 microF capacitor. What is the voltage across the capacitor?