4. A body will have zero weight
a. on top of a mountain.
b. on the plains.
c. at the centre of the earth.
d. on the sea bed.
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Answer:
answer c
at the centre of earth
Explanation:
Inside the earth, gravitational force will vary as
F=r2GMR3r3=R3GMr
Hence, at r=0, F=0.
Answer is option A.
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