Question

Consider the situation in the figure. The work done in taking a point charge from P to A is WA, from P to B is WB and from P to C is WC.
(a) WA < WB < WC
(b) WA > WB > WC
(c) WA = WB = WC
(d) None of these
Figure

Answer 1

(c) is correct.

Explanation:

Points A, B, and C are within the same size of charge q i.e. They lie on a potentially equipotential surface. Therefore work done to move a charge from A to B (WAB) or B to C (WBC) is zero.

Therefore work has been done to carry a charge from P to A = WA,  

In the case of P to B,  

〖 W〗_B  = W_A+W_AB  = W_A

in case of P to C,  

〖 W〗_C= W_A+W_AB  +W_BC  = W_A  

so,W_A= 〖 W〗_B   = 〖 W〗_C

Answer 2

Answer:

The answer is B. WB and WC are the same because in both cases, the body is immersed in  tap water but WA is the weight in air

Explanation:

The answer is B. WB and WC are the same because in both cases, the body is immersed in  tap water but WA is the weight in air

This is answer is true and legit. Good luck! Keep hustling.