Q.

Two charges each of 1 coulomb are at a distance 1km apart, the force between them is

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a

9×103 Newton

b

9×10−3 Newton

c

1.1×10−4 Newton

d

104 Newton

answer is A.

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Detailed Solution

F=kQ2r2=9×109×12×1(1000)2=9×103N
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