The bob of a simple pendulum has mass 2 g and a charge of 5.0 $$\mu$$C. 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/s$$^{2}$$)

A

$$\tan^{-1}(0.2)$$

B

$$\tan^{-1}(2.0)$$

C

$$\tan^{-1}(0.5)$$

D

$$\tan^{-1}(5.0)$$