A metal surface of area `1 m^(2)` is charged with `sqrt(8.85)muC` in air. The mechanical force acting on it is

Options

A. `0.05N//m^(2)`
B. `1.5N//m^(2)`
C. `0.5N//m^(2)`
D. `2.5N//m^(2)`

Answer

C

Explanation

`d_(s)=1m^(2),q=sqrt(8.85)muC,f=?`
`f=q^(2)/(2in_(0)kds^(2))=(8.85xx10^(-12))/(2xx8.85xx10^(-12)xx1)=0.5N//m^(2)`