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Question: At what height from the ground will the value of ‘g’ be the same as that in 10 km deep mine below th...

At what height from the ground will the value of ‘g’ be the same as that in 10 km deep mine below the surface of earth

A

20 km

B

10 km

C

15 km

D

5 km

Answer

20 km

Explanation

Solution

Same change in the value of g can be observed at a depth x and height 2x

given d=x=10 km∴h=2x=20 kmd = x = 10 \mathrm {~km} \quad \therefore h = 2 x = 20 \mathrm {~km}