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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-4 V

4 V

Zero

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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