AP EAMCET Medical 2016 Paper

An inclined plane making an angle 30° with the horizontal is placed in a uniform horizontal electric field of 100 Vm−1. A particle of mass 1kg and charge 0.01 C is allowed to slide down from rest from the top of the inclined plane. If the coefficientof friction is 0.2, the particle reaches the bottom of the inclined plane in 1 second. Then the length of the inclined plane is (Acceleration due to gravity = 10 ms−2)