Question

A candle of diameter d is floating on a liquid in a cylindrical container of diameter D(D >> d) as shown in figure. If it is burning at the rate of 2 cm/hour then the top of the candle will

• A. remain at the same height
• B. rise at the rate of 2 cm/hour
• C. fall at the rate of 2 cm/hour
• D. go up at the rate of 1 cm/hour

Answer 1

The correct option is D

go up at the rate of 1 cm/hour

The density of candle is a half of density of liquid. Therefore if it burn 2cm/hr, the candle will come up by 1 cm from the water in 1 hour.