Two bodies of masses M1 and M2 are placed at a distance R apart. Then at the position where the gravitational field due to them is zero, the gravitational potential is
A
−G√M1R
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B
−G√M2R
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C
−(√M1+√M2)2GR
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D
−(√M1−√M2)2GR
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Solution
The correct option is C−(√M1+√M2)2GR Let O be the point where gravitational field due to the masses is Zero.
Thus, GM1mx2−GM2m(R−x)2=0⟹x=√M1R√M1+√M2
Now gravitational potential at point O, Vo=[−GM1x2]+[−GM2(R−x)2]