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

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If the length of a simple pendulum is equal to the radius of the earth, its time period will be
(a) \( 2 \pi \sqrt{R / g} \)
(b) \( 2 \pi \sqrt{R / 2 g} \)
\( \mathrm{P} \)
(c) \( 2 \pi \sqrt{2 R / g} \)
(d) infinite
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