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At the centre of the earth, the value of $g$ becomes

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Zero

Unity

Infinity

none of these

answer is A.

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Detailed Solution

At the centre of the earth, the value of

g

becomes zero.
Acceleration due to gravity varies directly with the distance from the centre, or

r

.
but change

\frac{1}{r^{2}}

r > R

The formula is given by

g = \frac{GM}{r^{2}}

r > R

\Rightarrow g = \frac{GMr}{R^{3}}

r

Therefore, when

r = 0, g

is zero.

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