Two point masses M and 3M are placed at a distance L apart. Another point mass m is placed in between on the line joining them so that the net gravitational force acting on it due to masses M and 3M is zero. The magnitude of gravitational force acting due to mass M on mass m will be
GMm(1+√3)2L2
GMmL2(1+√3)
GMm(1−√3)2L2
GMm(1+√3)L2
A
GMm(1+√3)L2
B
GMm(1+√3)2L2
C
GMmL2(1+√3)
D
GMm(1−√3)2L2
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Solution
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Net force on any mass at the position between two masses is zero
Let say the distance between M and m is "x" so the net force due to M and 3M on mass m is zero
so we have,
GMmx2=G3Mm(L−x)2
now by solving above equation
L−x=√3x
→x=L1+√3
now by the formula of force between two mass
F=GMmx2
plug in the value of "x" in it
F=GMm(L1+√3)2
F=GMm(√3+1)2L2
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