A charge of `10^(-9) C` is placed on each of the `64` identical drops of radius `2 cm`. They are then combined to from a bigger drop. Find its potential

Options

A. `7.2 xx 10^(3) V`
B. `7.2 xx 10^(2) V`
C. `1.44 xx 10^(2) V`
D. `1.44 xx 10^(3) V`

Answer

A

Explanation

`V = n^(2//3) v rArr V = (64)^(2//3) xx 9 xx 10^(9) xx (10^(-9))/((2 xx 10^(-2)))`
`= 7.2 xx 10^(3) V`