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A small sphere of mass m and carrying a ...

A small sphere of mass m and carrying a charge q is attached to one end of an insulating thread of length a, the other end of which is fixed at (0,0) as showing in figure. There exists a uniform electric field `vecE=-vecE_0hatj` in the region. The minimum velocity which should be given to the sphere at (a, 0) in the direction shown so that it is able to complete the circle around the origin is (There is no gravity)

A

`sqrt((5qE_0a)/(m))`

B

`sqrt((3qE_0a)/(m))`

C

`sqrt((qE_0a)/(m))`

D

`2sqrt((qE_0a)/(m))`

Text Solution

Verified by Experts

The correct Answer is:
B
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