Question

what is the force between the. small charged spheres having charges of 2×10-7C and 3×10-7C placed30 cm apartin air?
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Answer 1

Explanation:

Charge on the first sphere, q1=2×10−7 C

Charge on the second sphere, q2=3×10−7 C

Distance between the spheres, r=30cm=0.3m

F=4πε0r2q1q2

Where, ε0= Permittivity of free space

4πε01=9×109Nm2C−2

F=(0.3)29×109×2×10−7×3×10−7=6×10−3N

Hence, force between the two small charged spheres is 6×10−3 N. The charges are of same nature. Hence, force between them will be repulsive.