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Updated on : 2022-09-05

Solution

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Correct option is D)

Given:

Two masses $m$ and $4m$ kept at a distance $r$

Let gravitetional potential is zero at a point $p$

$x_{2}Gm −(r−x)_{2}G(4m) =0$

$x1 =(r−x)2 $

$r−x=2x$

$3x=r$

$x=r/3$

Potential at point $p$

$V=−(2r/3)4Gmm −(r/3)Gmm $

$V=−Gm(r6 +r3 )=−9rGm $

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