A small sphere carrying a charge 'q' is hanging in between two parallel plates by a string of length L. Time period of pendulum is T0. when parallel plates are charged, the time period changes to T. The ratio T/T0 is equal to
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a
g+qEmg1/2
b
gg+qEm3/2
c
gg+qEm1/2
d
none of these
answer is C.
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Detailed Solution
Net downward force mg′=mg+qE⇒ Effect acceleration g′=g+qEmHence time periodT=2πlg′=2π⋅lg+qEmGiven : T0=2πlg So, TT0=gg+qEm