Bihar Police Constable Model Paper 1

The correct answer is 24 Joule.
The potential difference across the two points is directly proportional to the work done per unit charge.
⇒ V = W/Q, where V is the potential difference, W is work done and Q is the charge.
⇒ W=Q * V
⇒ we have Q = 2 coulomb, V = 12 Volt,
⇒ W = 2 * 12
⇒ W= 24 joule