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Q.

Two identical charges repel each other with a force equal to 10 mg wt when they are 0.6 m apart in air, (g=10ms−2) . The value of each charge is

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a

2×10−7C

b

2 mC

c

2nC

d

2μC

answer is D.

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Detailed Solution

F=14πε0q1q2d2

∴(10×10−3)×10=(9×109)×q2(0.6)2

⇒q2=4×10−12

⇒q=2×10−6C=2μC

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