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Q.

Three charges q+q and q are placed at the corners of an equilateral triangle of side ‘a’.  The resultant electric force on a charge +q placed at the centroid O of the triangle is 

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a

q24πϵoa2

b

3q22πϵoa2

c

3q24πoa2

d

q22πoa2

answer is D.

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Detailed Solution

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Question Image

Fnet=2×F-qcos 60o+F+q=2kq2d2

d=a3

F=2×14πoq2a2×3=3q22π0a2

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Three charges –q, +q and –q are placed at the corners of an equilateral triangle of side ‘a’.  The resultant electric force on a charge +q placed at the centroid O of the triangle is