Answer:
Time period, \[T=2\pi \sqrt{\frac{l}{g}}\] i.e., \[T\propto {{l}^{1/2}}\] The percentage increase in time period is given by \[\frac{\Delta \Tau }{T}\times 100=\frac{1}{2}\frac{\Delta l}{l}\times 100\] \[=\frac{1}{2}\times 21%=\mathbf{10}\mathbf{.5%}\]
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