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Q.

Two bodies of masses M1 = m and M2 = 4m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is

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a

zero

b

-4Gmr

c

-6Gmr

d

-9Gmr

answer is D.

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Detailed Solution

x=r4mm+1

x=r3

V=−Gmr/3−G(4m)2r/3

V=−3Gmr−12Gm2r

V=−9Gmr

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