In the expression for time period $T$ of simple pendulum $T=2 \pi \sqrt{\frac{l}{g}}$, if the percentage error in time period $T$ and length $l$ are $2 \%$ and $2 \%$ respectively then percentage error in acceleration due to gravity $g$ is equal to ......... $\%$
A$8$
B$2$
C$4$
D$6$
Medium
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D$6$
d $\mathrm{T}=2 \pi \sqrt{\frac{\ell}{\mathrm{g}}}$
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