The weight of a body at the centre of the ear | vedclass

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(A) The weight of a body is defined as the gravitational force exerted on it by the earth,given by $W = mg$.Inside the earth,at a distance $r$ from th

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Zero

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(A) The weight of a body is defined as the gravitational force exerted on it by the earth,given by $W = mg$.Inside the earth,at a distance $r$ from the center,the acceleration due to gravity $g'$ is given by $g' = g \frac{r}{R}$,where $R$ is the radius of the earth.At the center of the earth,the distance $r = 0$.Substituting $r = 0$ into the formula,we get $g' = g \frac{0}{R} = 0$.Since the weight $W = mg'$,at the center of the earth,the weight $W = m 	imes 0 = 0$.Therefore,the weight of a body at the center of the earth is zero.

The weight of a body at the centre of the earth is

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