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The time rate of change of the radius of...

The time rate of change of the radius of a sphere is ` (1)/(2 pi) `. When its radius is 5 cm , then the rate of change of the area of the surface ( in square cm ) of the sphere with time will be-

A

25

B

15

C

24

D

20

Text Solution

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The correct Answer is:
D
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CHHAYA PUBLICATION-MCQ ZONE 3 -Question Paper 6
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