If the change in the value of g at the height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
x = h
x = 2 h
x = $\dfrac{h}{2}$
x = h2
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The period of a satellite in a circular orbit of radius R is T. The period of another satellite in circular orbit of radius 4R is