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If the change in the value of ‘g’ at a 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)

(a)       x=h                                       (b)    x=2h

(c)        x=h/2                                  (d)     x=h2

Answer:  b

(11)

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