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Q.

Consider two identical iron spheres , one which lie on a thermally insulating plate, while the other hangs from an insulating thread. Equal amount of heat is supplied to the two spheres, then

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a

Temperature of B will be greater than A

b

Can’t be predicted 

c

Temperature of A will be greater than B 

d

Their temperature will be equal

answer is B.

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Detailed Solution

Temperature of B will be higher because, due to expansion centre of mass B will come down same heat is supplied but in B, Potential energy is decreased therefore internal energy gain will be more.

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