Physics And Measurement Question 37

Question: A wire has a mass $ 0.3\pm 0.003g $ , radius $ 0.5\pm 0.005mm $ and length $ 6\pm 0.06cm $ . The maximum percentage error in the measurement of its density is

[IIT (Screening) 2004]

Options:

A) 1

B) 2

C) 3

D) 4

Show Answer

Answer:

Correct Answer: D

Solution:

$ \because $ Density, $ \rho =\frac{M}{V}=\frac{M}{\pi r^{2}L} $

$ \Rightarrow \frac{\Delta \rho }{\rho }=\frac{\Delta M}{M}+2\frac{\Delta r}{r}+\frac{\Delta L}{L} $

$ =\frac{0.003}{0.3}+2\times \frac{0.005}{0.5}+\frac{0.06}{6} $

$ =0.01+0.02+0.01=0.04 $

$ \therefore $ Percentage error $ =\frac{\Delta \rho }{\rho }\times 100=0.04\times 100=4% $



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