A system S consists of two coils A and B. The coil A carries a steady current I while the coil B is suspended nearby as shown in figure. Now, if the system is heated, so as to raise the temperature of two coils steadily, then
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A
Coil A carries a steady current with increase in temperature, its resistance increases and so current is decreasing at a constant rate, this induces an emf in coil B which opposes this change, i.e. current in coil B is in same direction of A, therefore they attract to each other.
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