The time period of a second's pendulum is $2\, sec$. The spherical bob which is empty from inside has a mass of $50\, gm$. This is now replaced by another solid bob of same radius but having different mass of $ 100\, gm$. The new time period will be .... $\sec$
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(c) $T = 2\pi \sqrt {\frac{l}{g}} $ (Independent of mass)
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