In a region of space an electric field line is in the shape of a semicircle of radius R. Magnitude of the field at all point is E. A particle of mass m having charge q is constrained to move along this field line. The particle is released from rest at A. (a) Find its kinetic energy when it reaches point B. (b) Find the acceleration of the particle when it is at midpoint of the path from A to B.

Answer

(a). `K_(B)=piqER`
(b). `a_(t)=(qE)/(m)sqrt(1+pi^(2))`