# The bob of a simple pendulum has mass 2g and a charge of 5.0 μC.

2 views
in Science

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)

by (-4,945 points)

Correct option  (2) tan–1 (0.5)

Explanation:

Tanθ = qE/Mg = ( 5 × 10-6 × 2 × 103)/(2 × 10-3 × 10) = 1/2

= θ = tan-1 (1/2)