If potential energy of a object in any conservative phase is U then, 
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If body is in equilibrium then net force performing on body is zero,
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There are three kinds of equilibrium
Stable Equilibrium:
If object is in stable equilibrium and if we displace object to a very small displacement dr then it will come back to starting position. For stable equilibrium 
Unstable Equilibrium:
If the object is in unstable equilibrium and if we displace the object to a very small displacement dr then it will not come back to its starting position. For unstable equilibrium 
Neutral Equilibrium:
In neutral equilibrium, if we displace object to a very small displacement then it will stick on its new point, For neutral equilibrium 
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