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Q.

What is the weight of an object with a radius R at the Earth's centre?

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a

Zero

b

Infinite

c

R times the weight at the surface of the Earth

d

One

answer is A.

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Detailed Solution

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We know, 
Weight(W) =mg where m= mass of an object, g= gravity. 

Since g=0 at the centre of the earth.
Then, W=mg=m×0=0

Therefore, the weight of an object at the centre of the earth of radius R is zero.

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