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Two planets have the same average density but their radii are  R1  and  R2 . If acceleration due to gravity on these planets be g1  and g2 respectively, then

(a)      g1/g2 =  R1/R2                                   (b)  g1/g2 =  R2/R1

(c)      g1/g2 = R12/R22                               (d)    g1/g2 = R1 3/R2 3

Answer:  a

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