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Heat current is maximum in which of the following?

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Heat current is maximum in which of the following?

(a) Copper

(b) Steel and copper

(c) Copper and steel

(d) Steel
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Correct option is (a) Copper

For explanation I would say: Heat current, dQ/dt is proportional to K

As the thermal conductivity of copper is maximum, heat current will be maximum in copper.
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