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The weight of an object at the centre of the earth of radius $R$ is:
(a) zero
(b) $R$ times the weight at the surface of the earth
(c) infinite
(d) $1/R^2$ times the weight at the surface of the earth
At the center of the earth, gravitational acceleration $(g)$ is zero.
So, the weight of the object on the center of the earth $W=mg$
$=m\times 0$
$=0$
So, at the center of the earth, the weight of the object is zero.
So, option (a) is correct.
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