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Q.

Three charges +q, -q and -q are kept at the vertices of an equilateral triangle of 10cm side. The potential at the mid point in between -q, -q, if q = 5µC is

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a

−6.4×105V

b

−12.8×104V

c

−6.4×104V

d

−12.8×105V

answer is D.

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Detailed Solution

V=V1+V2+V3;V1=V2=14πε0(−q)(a/2)V3=14πε0(q)3a2

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