The value of g (acceleration due to gravity) at earth's surface is 10ms−2. It's value at the centre of the earth which is assumed to be a sphere of radius R metre and uniform mass density is,
A
5
B
10R
C
102R
D
zero
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Solution
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Net force acting on an object placed at the center of the earth is zero since all the forces act on the object spherical symmetrically and hence cancel out.
Since there is no force at the center of earth, there would be no acceleration.
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