# A large insulates sphere of radius r charged with Q units of electricity is placed in contact with a small insulated…..

A large insulates sphere of radius r charged with Q units of electricity is placed in contact with a small insulated uncharged sphere of radius r’ and is then separated. The charge on the smaller sphere will now be

(a) (Q(r’+ r))/r’

(b) (Q(r’+ r))/r

(c) Qr/(r’+ r)

(d) Qr’/(r’ + r)

Ans: (d)