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Q.

Find moment of inertia of a uniform annular disc of mass 100 g, having inner radius l0 cm and outer radius 20 cm, about an axis passing through its centre and perpendicular to its plane :

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a

5 x 10^-3 kg. m²

b

1.5 x 10^-3 kg.m²

c

2.5x10^-3 kg.m²

d

6 x 10^-3 kg.m²

answer is A.

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Detailed Solution

$I = M [\frac{R_{1}^{2} + R_{2}^{2}}{2}] = 0 .1 [\frac{(0 .1)^{2} + (0 .2)^{2}}{2}]$
2.5x10^-3 kg.m²

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