A force $F$ is applied on a square area of side $L$. If the percentage error in the measurement of $L$ is $2 \%$ and that in $F$ is $4 \%$, what is the maximum percentage error in pressure?
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(d)
$P =\frac{ F }{ L ^2}$
$\frac{\delta P }{ P }=\frac{\delta F }{ F }+2 \frac{\delta L }{ L }$
$\frac{\delta P }{ P }=4 \%+2 \times 2 \%=8 \%$
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