AP EAMCET Engineering 2016 Code C Paper

Two charges each of charge +10µc are kept on Y-axis at y=−a and y=+a respectively. Another point charge −20µc is placed at the origin and given a small displacement x(x<<a) along X-axis. The force acting on the point charge is ( x and a are metres,

1

4π∊0

=9×109Nm2C−2)