What is the energy in the spark produced by discharging the second capacitor? 1. The same as the discharge spark of the first capacitor 2. More energetic than the discharge spark of the first capacitor 3. Less energetic than the discharge spark of the first capacitor

Complete Question

The two isolated parallel plate capacitors be-  low, one with plate separation d and the other  with D > d, have the same plate area A and

are given the same charge Q.

What is the energy in the spark produced by discharging the second capacitor?

 1. The same as the discharge spark of the first capacitor

2. More energetic than the discharge spark of the first capacitor

3. Less energetic than the discharge spark of the first capacitor

The correct option is 2

Explanation:

The formula for the energy stored in the capacitor is

And generally the formula for finding the capacitance of a capacitor is

We can denote the capacitance of the first capacitor as

          and   denote the capacitance of the second  capacitor as

Looking at this formula we can see that C varies inversely with d            

as D > d it means that

                Since the charge is constant

                          i.e U varies inversely with C

           So   =>

This means that the energy of spark would be more for capacitor two compared to capacitor one

The correct option is 2

the answer is a. hope this .