Distance between centres of spheres, r = 50 cm = .5m
Charge on each sphere, q = 6.5 × 10-7 C
Mutual force of electrostatic repulsion
Where, F= mutual force of attraction
q1 = charge on sphere 1
q2 = charge on sphere 2
r = distance between centres
Where, ε0 is the permittivity of the free space.
Now, putting the values of q1, q2 and r in equation (1).
⇒ F = 1.52 × 10-2 N
Hence the mutual force between two spheres is 1.52 × 10-2N. Since the sign is positive so the force is repulsive in nature.
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