Two insultating small spheres are rubbed against each other and placed `96 cm` apart. If they attract each other with a force of `0.1 N`, how many electrons were transferred from one sphere to the other during rubbing ?

Options

A. `10^(11)`
B. `2 xx 10^(13)`
C. `3 xx 10^(11)`
D. `4 xx 10^(11)`

Answer

2

Explanation

`F = (1)/(4 pi in_(0)) (q^(2))/(r^(2))`
`0.1 = ((9 xx 10^(9)) (q^(2)))/((0.96)^(2)) rArr q = (0.96)/(3)xx 10^(-5)`
`= n(1.6 xx 10^(-19))`
`n = 2 xx 10^(13)`