Two point charger `+8 mu` and `+12 mu` repel each other with a force of 48 N. When an additional charge of `-10 mu` is given to each of these charges (the distance between the charges is unaltered) then the new force is

Options

A. Repulsive force of 24 N
B. Attractive force of 24 N
C. Repulsive force of 2 N
D. Attractive force of 2 N

Answer

(d)

Explanation

Force,`F_(1) = kq_(1)q_(2)/r^(2) = k(8)(12)/r^(2)`
`F_(2) = kq_(1)q_(2)/r^(2) = k(2)(2)/r^(2)`
`F_(2)/F_(1) = 4/ 8 xx 12`
`rArr F_(2)/48 = 1/24`
`:. F_(2) = 2N`
Attractive force of 2N