Question

A uniformly charged sphere of radius R = 2 m and volume charge density ρ has a spherical cavity as shown. A point object of mass m = 1 kg and charge q = 2 x 10^-4C is thrown, from point A. The minimum velocity required at A for it to reach point B is (ρ = 3ɛ₀ x 10^-3cm^-3)

(a) 0.02 ms^-1 

(b) 0.2 ms^-1 

(c) 0.4 ms^-1 

(d) 0.04 ms^-1 

Answer 1

Correct option: (a) 0.02 ms^-1

Explanation: 

The motion of the charge will be like projectile with range