AP EAMCET Medical 2017 Shift 1 Paper

Two non-conducting thin spherical shells of uniformly distributed charge of+10 µC each and radius 1 cm each are placed with a separation of 5 cm between their centres. A positive charge of 0.9 µC is placed inside one of the shells at a distance of 0.5cm from its centre on the line joining the centres of the two shells as shown in the figure. The net electrostatic force on 0.9 µC charge is ... N.
(

1

4π∊0

=9×109Nm2C−2)