Q82 / 90 · JEE Main 2022 (29 Jul Shift 1) · Physics

If the acceleration due to gravity experienced by a point mass at a height h above the surface of earth is same as that of the acceleration due to gravity at a depth αhh≪Re ) from the earth surface. The value of α will be _____ .

(use Re=6400 km)

Correct answer: 2

Solution

Acceleration due to gravity at a height h above the earth's surface is given by g1-2hRe 

And acceleration due to gravity at depth d below the earth surface is given by g1-dRe.

As gabove=gbelow

So, g1-2hRe=g1-dRe

⇒2hRe=dRe

⇒αh=d

Thus, the value of α=2.

Hence, the correct answer is 2.

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