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Q.

A force F is applied on a square plate of length L. If the percentage error in the determination of L is 3% and in F is 4%, then permissible error in the calculation of pressure is

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a

13%

b

10%

c

7%

d

12%

answer is B.

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Detailed Solution

$P = \frac{F}{A} = \frac{F}{l^{2}} \Rightarrow \frac{ΔP}{P} = \frac{ΔF}{F} + 2 \cdot \frac{Δl}{l}$

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