If the volume of a block of metal changes by $0.12\%$ when it is heated through $20^o\,C$, the coefficient of linear expansion (in per $^oC^{-1}$) of the metal is :-
If the volume of a block of metal changes by $0.12\%$ when it is heated through $20^o\,C$, the coefficient of linear expansion (in per $^oC^{-1}$) of the metal is :-
- A
$10^{-5}$
- B
$2 \times 10^{-5}$
- C
$3 \times 10^{-5}$
- D
$5 \times 10^{-5}$
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