A single point charge, may be positive or negative.
The simple answer: the potential at a point some distance, r from a monopole is kQ / r, where k is Coulumb's constant: 9.0E9 Q is the charge of the monopole and r is the distance from the monopole. And how to get there: Since electric force is kq1q2/ r2, the electric field ( Force per charge) is kQ/r2. The voltage of a particle is defined to be the integral of the electric field with respects to r. Thus integrating you get the above equation.
Magnetic field lines must be closed. There is no such thing as a magnetic monopole. A magetic field line might be very long but eventually it will bend aroung forming a closed loop. Electric field lines can originate from a point (hence they are open). A charge (like an electron) is a electric monopole. They show which way iron shavings would align themselves. They always form complete loops. They show which way iron shavings would align themselves. (APEX)
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