Question

Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B.

• A. The work done in figure (i) is the greatest.
• B. The work done in figure (ii) is the least.
• C. The work done is the same in figure (i), (ii) and (iii)
• D. The work done in figure (iii) is greater than figure (ii) but equal to that in figure (i).

Answer 1

Answer: (C)

The work done is the same in figure (i), (ii) and (iii)

Answer 2

: In all the three figures,

$V_{A} = 20V$and $V_{B} = 40V$

Work done in carrying a charge q form A to B is

$W = q(V_{B} - V_{A})$

Hence, work done is same in all figures.