Question

What is the force between two small charged spheres having charges of C and C placed 30 cm apart in air?

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Solution
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Charge on the first sphere,  C

Charge on the second sphere,  C

Distance between the spheres,

Where,  Permittivity of free space

Hence, force between the two small charged spheres is  N. The charges are of same nature. Hence, force between them will be repulsive.

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Physics Part-I
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