 What is the difference between an electric field and a magnetic field? An electric field is caused by both, moving and non-moving electric charges. A magnetic field, on the other hand, is generated only by moving charges. A positive charge is the source of the electric field. A negative charge is the sink of the electric field. In nature, negative and positive charges can occur independently of each other, as electric monopoles. Magnetic monopoles, on the other hand, as far as we know, do not exist in nature. That means there is no magnetic north pole or magnetic south pole that occurs alone. North pole as a source and south pole as a sink always occur together. Magnetic field lines are closed loops. Electric field lines, on the other hand, do not have to be closed, but can, for example, go to infinity like the field lines of a point charge. A charge Q in an electric field E experiences an electric force equal to Q times E. A moving charge in a magnetic field B, perpendicular to the motion, experiences a magnetic force equal to Q times V times B. The unit of the electric field is volt per meter, and the unit of the magnetic field is volt second per square meter, or in short, Tesla. When an electric charge is placed in an external electric field, the charge is accelerated. As a result, the charge changes its kinetic energy. On the other hand, when an electric charge is placed in a magnetic field, the charge is not accelerated. The charge does not change its energy. In short, an electric field does work on the charge, but a magnetic field does not. The magnetic field does not work on the charge even when the charge is moving. An electric field can be shielded, for example, with the help of a Faraday cage. A magnetic field, on the other hand, cannot be shielded, but at least deflected.