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Q.

The height of the point vertically above the earth’s surface, at which acceleration due to gravity becomes 1% of its value at the surface is (Radius of the earth = R)

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a

8 R

b

9 R

c

10 R

d

20 R

answer is B.

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Detailed Solution

g'g= RR+h2⇒1100 = RR+h2⇒h=9R

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The height of the point vertically above the earth’s surface, at which acceleration due to gravity becomes 1% of its value at the surface is (Radius of the earth = R)