A ball of mass 10 -2 kg & having charge + 3 x 10 -6 C is tied at the end of a 1 m long thread. The other end of the string is fixed and a charge of - 3 x 10 -6 C is placed at this end. The ball can move in a circular orbit of radius 1 m in a vertical plane. Initially the ball is at the bottom. Find the minimum initial horizontal velocity of the ball so that it will be able to complete the full circle. [g = 10 m/s 2 .]
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(u = 
= 7.6 m/s)
Sol.
Here, q = 3 × 10 –6 C
r = 1 m
u = initial horizontal velocity of ball.
At highest point S tension in the string becomes zero.
& let velocity at this point = v
From conservation of energy between P & S
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