A metal rod is subjected to cycles of magnetisation at the rate of 42 ~Hz . Density of the metal is 6 10^3 ~kg ~m ⁻³ and its specific heat capacity is 0.1 10⁻³ cal kg ⁻¹ ^ C ⁻¹ . If the area of its B-H loop corresponds to energy density of

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A metal rod is subjected to cycles of magnetisation at the rate of 42 ~Hz . Density of the metal is 6 10^3 ~kg ~m ⁻³ and its specific heat capacity is 0.1 10⁻³ cal kg ⁻¹ ^ C ⁻¹ . If the area of its B-H loop corresponds to energy density of 10⁻² Jm ⁻³ , then the rise in its temperature in one minute is

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Correct answer: B. 10^ C

Energy of area of B-H loop, array lll Q=m s( ) 10⁻² 42 60=6 10^3 0.1 10⁻³ 4.2 = 10⁻² 42 60 6 10^3 0.1 10⁻³ 4.2 =10^ C array

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