If the length of a simple pendulum is equal to the P radius of the ...

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If the length of a simple pendulum is equal to the
P radius of the earth, its time period will be

W
(1) \( 2 \pi \sqrt{\frac{R}{g}} \)
(2) \( 2 \pi \sqrt{\frac{R}{2 g}} \)
(3) \( 2 \pi \sqrt{\frac{2 R}{g}} \)
(4) infinite
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