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The time rate of change of the radius of a sphere is 1/2π. When it’s radius is 5cm, what will be the rate of change of the surface of the sphere with time?(a) 10 sq cm(b) 20 sq cm(c) 30 sq cm(d) 40 sq cmI got this question during an internship interview.This intriguing question comes from Application of Derivative topic in section Application of Derivatives of Mathematics – Class 12 |
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Answer» The correct choice is (b) 20 sq cm |
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