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Fig (a) and (b) show the field lines of ...

Fig (a) and (b) show the field lines of a single positive and negative charges respectively .
Give the sign of the work done by an external agency in moving a small negative charge from B to A .

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Verified by Experts

Work done by an external agency (against the electric field ) in moving small -ve charge from B to A = `- q (V_(A) - V_(B)) = q (V_(B) - V_(A))` and it has a + ve sign .
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