Correct Answer: Option B

Explanation

\(T = 2\pi \sqrt{\frac{l}{g}}\)

\(\frac{T}{2\pi} = \sqrt{\frac{l}{g}}\)

\((\frac{T}{2\pi})^{2} = \frac{l}{g}\)

\(\therefore g = \frac{4 \pi^{2} l}{T^{2}}\)

There is an explanation video available below.

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