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Question

If length of second pendulum becomes four times, then its time period will become :


A
four times
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B
eight times
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C
two times
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D
same as before
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Solution

The correct option is C two times
Time period of second pendulum is given by   $$T = 2\pi\sqrt{\dfrac{l}{g}}$$
$$\implies \ T\propto\sqrt{l}$$
Thus if the length if second pendulum is increased by 4 times, its time period gets increased by 2 times.

Physics

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