First slide

Physical quantities and units

Question

To determine the Young's modulus of a wire, the formula is $Y = \frac{F}{A} \times \frac{L}{Δ L}$ ; where L=length, A=area of cross-section, $∆$ L= change in length of the wire when stretched with a force F. The conversion factor to change its unit from CGS to MKS system is

Easy

A

1
B

10
C

0.1
D

0.01

Solution

$Y = \frac{F}{A} \cdot \frac{L}{Δ L} = \frac{dyne}{{cm}^{2}} = \frac{10^{- 5} N}{10^{- 4} m^{2}} = 0.1 N / m^{2}$

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