The bob of a simple pendulum has mass 2g and a charge of 5.0 μC. It is at rest in a uniform horizontal electric field of intensity 2000 V/m. At equilibrium, the angle that the pendulum makes with the vertical is – (take g = 10 m/s2)
(1) tan–1 (5.0)
(2) tan–1 (0.5)
(3) tan–1 (0.2)
(4) tan–1 (2.0)