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Q.

Four identical charges +50 μC each are placed, one at each corner of a square of side 2m. How much external energy is required to bring another charge of +50 μC from infinity to the centre of the square Given 14πε0=9×109Nm2C2

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a

64 J

b

41 J

c

16 J

d

10 J

answer is A.

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Detailed Solution

Potential at the centre of squareV=4×9×109×50×10−62/2=902×104 VWork done in bringing a charge (q=50 μC) from ∞ to centre (O) of the square is W=qV0−V∞=qV0⇒W=50×10−6×902×104=64J
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