Question

The figure shows two identical parallel plate capacitors A and B of capacitances C connected to a battery. The key K is initially closed. The switch is now opened and the free spaces between the plates of the capacitors are filled with a dielectric constant 3. Then which of the following statement(s) is/are true?

• A. When the switch is closed, the total energy stored in the two capacitors is CV2.
• B. When the switch is opened, no charge is stored in capacitor B.
• C. When the switch is opened, energy stored in capacitor B is $\frac{3}{2}$ CV2.
• D. When the switch is opened, the total energy stored in capacitors is $\frac{5}{3}$CV2.

Answer 1

Answer: (A), (D)

When the switch is closed, the total energy stored in the two capacitors is CV2.

Answer 2

The correct answer is/are option(s):
(A): When the switch is closed, the total energy stored in the two capacitors is CV2.
(D): When the switch is opened, the total energy stored in capacitors is $\frac{5}{3}$CV2.