Question

# Two unlike charges attract each other with a force of 10N. If the distance between them is doubled, the force between them is :

A
40N
B
20N
C
5N
D
2.5N
Solution
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#### We know F=14πε0q1q2r2=10Nif distance is doubled.Fnew=14πε0⋅q1q2(2r)2=104=2⋅5N

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