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Two points masses 'm' and 2m are kept at...

Two points masses 'm' and `2m` are kept at certain distance as shows in figure. Draw `E - r` and `V - r` graphs along the line joining them corresponding to given mass system.

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`E - r` Graph

Region I Fields of `m` and `2m` both are positive. Hence, net field at any point is also positive.
Region II Field at `m` is negative and field of `2m` is positive. So, at some point `p` (nearest to `m`) two field are equal and opposite and net field is zero.
Region III fieled of `m` and `2m` both are negative . Hence, net field at any point is also negative.
`V - r` Graph

Gravitational potential is always negative on both sides. So, net potential at any point is always negative. Between two masses varies between `- oo` and `- oo`. So, graph is as shows in figure.
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