A metal sphere of radius 10 cm is charged to a potential of 100 V. The outward pull per unit area of the surface is

Options

A. `4.4xx10^(-6)N//m^(2)`
B. `2.4xx10^(-6)N//m^(2)`
C. `4.4xx10^(6)N//m^(2)`
D. `4.2xx10^(-6)N//m^(2)`

Answer

A

Explanation

`f=1/2epsi_(0)k(V/d)^(2)`
`=(8.85xx10^(-12)xx1)/2xx(100/(10xx10^(-2)))^(2)`
`=4.4xx10^(-6)N//m^(2).`