A ball of mass 1 g having a charge of 
is tied to one end of a string of length 
can rotate in a vertical plane in a uniform electric field 
directed upwards. The minimum horizontal velocity that must be given to the ball at the lowest position so that it completes the vertical circle is (Let, 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Net effective force on the ball,
Now, effective gravitational acceleration at lowest position is given as,
The minimum horizontal velocity that mut be given to the ball at the lowest position is,
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