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A spring - block system undergoes vertic...

A spring - block system undergoes vertical oscillation above a large horizontal metal sheet with uniform positive charge. The time period of the oscillation will be is given a charge `Q` , its time period of oscillation will be

A

`T`

B

`gt T`

C

`lt T`

D

`gt T` if `Q` is positive and `lt T` if `Q` is negative

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The correct Answer is:
A
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