Answer:
By
convention, for forces which fall off to zero at large distances, the potential
energy at infinity is taken to be zero. These forces may be attractive or
repulsive. Calculations show that if the forces are attractive, then potential
energy at finite distance is Negative and vice-versa. On this basis, we
conclude that
(a) for electron positron bound state, Potential Energy is negative
(b) for planet satellite system, potential energy is again negative.
(c) for electron-electron system, potential energy is positive.
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