A candle of diameter \( d \) is floating on a liquid in a cylindrical container of diameter \( D...

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A candle of diameter \( d \) is floating on a liquid in a cylindrical container of diameter \( D(Dd) \) as shown in figure. It it is burning at the rate of \( 2 \mathrm{~cm} / \mathrm{h} \). Then, the top of the candle will
(a) remain at the same height
(b) fall at the rate of \( 1 \mathrm{~cm} / \mathrm{h} \)
(c) fall at the rate of \( 2 \mathrm{~cm} / \mathrm{h} \)
(d) go up at the rate of \( 1 \mathrm{~cm} / \mathrm{h} \)
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