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Q.

Two point charges 3×10−6C and 8×10−6C repel each other by a force of 6×10−3N. If each of them is given an additional charge -6×106C, the force between them will be

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a

2.4×10−3N (attractive)

b

2.4×10−9N (attractive)

c

1.5×10−3N (repulsive)

d

1.5×10−3N (attractive)

answer is D.

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Detailed Solution

F∝Q1Q2⇒F1F2=Q1Q2Q1'Q2'=3×10−6×8×10−63×10−6−6×10−68×10−6−6×10−6=3×8−3×2=−41⇒F2=−F14=−6×10−34=−1.5×10−3N (Attractive)
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