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)

In all the three figures, $V_{A} =20 \, V$ and $V_{B} = 40 \, V$
Work done in carrying a charge $q$ from $A$ to $B$ is
$W=q \left(V_{B}-V_{A}\right)$
Hence, work done is same in all figures