The bodies of masses 100kg and 8100kg are held at distance of 1m. The gravitational field at a point on the line joining them is zero. The gravitational potential at that point in J/kg is (G=6.67×10−11N.m2/kg2)
−6.67×10−7
−6.67×10−10
−13.34×10−7
−6.67×10−9
A
−6.67×10−9
B
−6.67×10−7
C
−6.67×10−10
D
−13.34×10−7
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Solution
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Distance of null point from 100kg x=1√8100100+1=110=0.1m
Gravitational potential at that point is: −G(m10.1+m29)=−6.67×10−11(10010−1+81009×10−1)
=−6.67×10−11(1000+9000)=−6.67×10−7m
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