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Q.

At the center of the earth the magnitude of the weight of a body is


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a

Zero

b

Equal to the mass of the body

c

Greater than g

d

Less than g 

answer is A.

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Detailed Solution

At the center of the earth the magnitude of the weight of a body is Zero.
The weight of an object is the force that works towards the earth. Weight becomes zero at the center point of the earth. At the center of Earth, the force due to the upper half of the Earth will withdraw from the force due to the lower half. Due to the fact of going down to the earth value of g decreases and at the center of the earth g=0.
Hence weight. w=mg
       =m × 0
     = 0  
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