Among two discs A and B, first have radius 10 cm and charge `10^(_6) -mu`C and second have radius 30 cm and charge `10^(-5)`- C. When they are touched, charge on both `q_(A)` and` q_(B)` respectively will, be

Options

A. `q_(A) = 2 . 75 mu C, q_(B) = 3 . 15 mu C`
B. `q_(A) = 1 . 09 mu C, qB = 1 . 53 mu C`
C. `q_(A) = q_(B) = 5 . 5 mu C`
D. None of these

Answer

C

Explanation

The charge on disc A is `10^(-6) mu C` . The charge on disc `B is 10 xx 10^(-6) mu C ` . The total charge on both ` = 11 mu C` . When touched , this charge will be distributed equally i . e . 5 . 5 ` muC` on each disc .