Question

Which is the force of repulsion between two positively-charged particles?

Answer 1

Let's assume the charges to be +q.

F = kq2r2

k = 9×109Nm2C−2,

F=4×10−9N,

r=5×10−10m

⟹4×10−9 = 9×109.q225×10−20

Or, q = 3.3×10−19C

q = -ne

⟹n=−3.3×10−19−1.6×10−19

No. Of electrons missing in each, n= 2

Answer 2

Electric force.

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