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A particle of mass m and charge q is osc...

A particle of mass `m` and charge `q` is oscillating simple harmonically from a string of length `l`.Now a vertical electric field of magnitude `E = (mg)/(2q)` is switched on.The ration of new time period to old time period is

A

A. `2:1`

B

B. 1:2`

C

C. `sqrt2 : 1`

D

D. `1:1`

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