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JEE MATHEMATICS MCQ: RATE MEASURE

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The rate of change of surface area of a sphere of raditis

r

when the radius is increasing at the rate of

2 \mathrm{~cm} / \mathrm{sec}

is proportional to

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Correct option: D

r

The correct answer is D (

r

) because the rate of change of the surface area of a sphere is directly proportional to its radius when the radius is increasing at a constant rate.

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