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A block of mass m is suspended vertically with a spring of spring constant k. The block is made to oscillate in a gravitation field. Its time period is found to be T. Now the space between the plates is made gravity free, and an electric field E is produced in the upward direction. Now the block is given a charge q. The new time period of oscillation is

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$T + 2 π \sqrt{\frac{qE}{md}}$

$2 π \sqrt{\frac{qE}{md}}$

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answer is A.

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Detailed Solution

Time period $T = 2 π \sqrt{\frac{m}{k}}$ It is independent of other forces acting on the block

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