A charge q1 exerts a force of 45N on a charge of q2=10−5C located at a point 0.2m from q1. The magnitude of q1 is
A
4×10−8C
B
2×10−5C
C
3×10−6C
D
5×10−8C
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Solution
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As we know electrostatic force between two charges F=kq1q2r2
⇒45=(9×109)(q1)(10−5)(0⋅2)2
⇒q1=45×0⋅2×0⋅29×109×10−5
⇒q1=2×10−5C
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