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Q.

In moving from A to B along an electric field line, the electric field does 6.4 x 10-19 J of work on an electron. If ϕ1, ϕ2 are equipotential surfaces, then the potential difference (VC - VA) is

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a

-4 V

b

4 V

c

Zero

d

64 V

answer is B.

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Detailed Solution

Work done by the field, W=q(-dV)=-eVA-VB =eVB-VA=eVC-VA  ∵VB=VC ⇒  VC-VA=We=6.4×10-191.6×10-19=4 V
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