A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations :
.
A : Key `K` is kept closed and plates of capacitors are moved apart using insulting handle.
B : Key `K` is opened and plates of capacitors are moved apart using insulting handle. Choose the correct options (s).

Options

A. In `A : Q` remains same but `C` changes
B. In `B : V` remains same but `C` changes
C. In `A : V` remains same and hence `Q` changes.
D. In `B : Q` remains same and hence `V` changes

Answer

C, D

Explanation

Situation `A` : Since Key `K` is kept closed, so `V` remains same. As the plates of capacitors are moved apart, `C` changes and hence `Q` changes. Situation `B` : Since key `K` is opened, the charge on the plates `Q` remains same. But `C` changes as the plates are moved apart and hence `V` changes.