Question

If on the surface of the Earth is , then it's value at a depth of (Radius of the earth ) is

A

B

C

D

Easy
Solution
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Correct option is C)

The value of gravity changes as we move away from or towards the centre of the Earth.
This is given by: , where is the mass of a planet of radius
So, ; substituting in above equation
 
Since we want the value of at depth() from the Earth's surface, we replace by




The given depth in the problem is  km, substituting we get,




Solve any question of Gravitation with:-
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