Q9 of 33 Page 12

The work done to move a charge along an equipotential from A to B

The work done to move a unit charge from any point A and B is defined as


Since, A and B have the same potential, the above integral can be written as


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Consider a uniform electric field in the direction. The potential is a constant

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Equipotential surfaces

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In a region of constant potential

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In the circuit shown in Fig. 2.4. initially key K1 is closed and key K2 is open. Then K1 is opened and K2 is closed (order is important).

[Take Q1’ and Q2’ as charges on C1 and C2 and V1 and V2 as voltage respectively.]



Then