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If the distance between the centre of earth and moon is $D$ and mass of earth is $81$ times that of moon.At what distance form the centre of earth gravitational field will be zero :
$\frac{D}{2}$
$\frac{2 D}{3}$
$\frac{4 D}{5}$
$\frac{9 D}{10}$

A

\frac{4 D}{5}

B

\frac{9 D}{10}

C

\frac{D}{2}

D

\frac{2 D}{3}

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