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Q.

A wax candle floats vertically in a liquid of density twice that of wax. The candle burns at the rate of 4cm/hr. Then, with respect to the surface of the liquid the upper end of the candle will

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a

remain at the same height

b

rise at the rate of 2cm/hr

c

fall at the rate of 2cm/hr

d

fall at the rate of 4cm/hr

answer is B.

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Detailed Solution

Vinρwaterg=Vρwaxg,Vout=V2, Ah=AL2,dhdt=12dLdt=2cm/hr

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