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Q.

Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B. Which of the following statements is true?

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a

The work done in Fig. (i) is the greatest.

b

The work done in Fig. (ii) is the least.

c

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

d

The work done in Fig. (iii) is greater than Fig. (ii) but equal to that in Fig. (i).

answer is C.

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Detailed Solution

The work done by a electrostatic force is given by W12 = q(V2 - V1 ). Here initial and final potentials are same in all three cases and same charge is moved, so work done is same in all three cases.
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Figure shows some equipotential lines distributed in space. A charged object is moved from point A to point B. Which of the following statements is true?