# 3. Energy of a capacitor.  A parallel-plate capacitor has area A and plate separation d....

###### Question: 3. Energy of a capacitor.  A parallel-plate capacitor has area A and plate separation d. Initially the capacitor has an air gap (K=1). (a) The capacitor is connected to a battery with voltage (EMF) E. What is the strength of the clectric field inside the capacitor? (5) (b) What is the charge on the capacitor?  The capacitor is disconnected from the battery. Then a metal block (K=0 ) with the same area and thickness d/2 is inserted into the gap, leaving two gaps that are d/4 wide. (c) What is the voltage on the capacitor afterwards?  (d) What is the change of energy of the capacitor during this process? 

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