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If the value of ‘g’ acceleration due to gravity, at earth surface is 10 m/s2 , its value in  m/s2  at the centre of the earth, which is assumed to be a sphere of radius ‘R’ metre and uniform mass density is

(a)  5                                         (b)  10/R

(c)   10/2R                                (d)  Zero

Answer: d

(13)

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