The value of g at a height h above the surface of the earth is the same as at a depth d below the surface of the earth. When both d and h are much smaller than the radius of earth, then which one of the following is correct
d=h2
d=3h2
.d=2h
d=h
A
d=h
B
.d=2h
C
d=3h2
D
d=h2
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Solution
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The value of gravity at a height h above earth's surface is given by gh=g(1−2hR) and at a depth d is given by gd=g(1−dR) Since these two values are same, we can see that d=2h
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