Q.

At what distance from the centre of the earth, the value of acceleration due to gravity g will be half that on the surface (R = radius of earth)

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a

2 R

b

R

c

1.414 R

d

0.414 R

answer is D.

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Detailed Solution

g′=gRR+h2⇒12=RR+h⇒R+h=2R⇒h=(2−1)R=0.414R
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