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Q.

A metal plate of area 1.2 m2 increases its area by 2.4 × 10-4 m2 when it is heated from 0°C to 100°C. The coefficient of cubical expansion of the metal expressed in per °C is

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a

2 × 10-6

b

4 × 10-6

c

6 × 10-6

d

3 × 10-6

answer is D.

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Detailed Solution

β=A2−A1A1t2−t1, γ=32β
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