Question

Can anyone please explain this Answer?

Answer 1

Answer:

Correct Answer is [ C.] q2/4πε0a

Explanation:

PEi = Initial energy of system = Q2/8πε0R

(self energy of shell)

PEf = Final energy of system = Q2/8πε0R + q x (-q)/4πε0a + kQ x q/R + kQ(−q)/R

⇒ Q2/8πε0R - q2/4πε0a

(self energy of shell) (Interaction energy between various charges)

⇒ Work done = PEf – PEi

= -q2/4πε0a

★ Magnitude of work done = q2/4πε0a

Answer 2

Answer:

Option C

Explanation:

Refer to attachment please ...