Question

I have a parallel plate capacitor with a charge Q on the positive plate. I somehow suspend a piece of rock between the two plates. What can I say for sure?

• A. The capacitance of the capacitor has increased.
• B. The capacitance of the capacitor has decreased.
• C. There is no change to the capacitor’s capacitance.
• D. We can’t say any of the above for sure.

Answer 1

The correct option is A The capacitance of the capacitor has increased.

On insertion of a dielectric of any shape the capacitance of a capacitor increases. It would however become very difficult to figure out the exact increase in capacitance in case.