Two charges are at a distance `d` apart. If a copper plate (conducting medium) of thickness `d//2` is placed between them , the effictive force will be

Options

A. 2F
B. F/2
C. 0
D. `sqrt2F`

Answer

C

Explanation

If a dielectric medium is partially filled between the charges.
`F =1/(4piepsilon_0).(Q_1Q_2)/((r-t+tsqrtk)^2)`
For conductor -
Dielectric constant k `rarroo`
Effective separation `= (r-t+t sqrtk) rarroo` , hence F = 0
Note: Effective air separation between them becomes infinite, so force becomes zero.