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What will be the weight of a body at the...

What will be the weight of a body at the centre of the earth?

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We know that, `g_(d)= g(1- (d)/(R ))`. At the centre of earth, d= R. So `g_("centre") =g (1- (R )/(R ))= 0`
Therefore, weight at the centre of earth, `W= mg_("centre")= m xx 0= 0`.
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