An electric field is a region around an electric charge where a force is exerted on other electric charges. It's a vector field, meaning it has both magnitude and direction. Think of it as the 'influence' a charge has on its surroundings.
A magnetic field is a region around a magnet or a moving electric charge where a magnetic force is exerted. Like the electric field, it's also a vector field. Magnetic fields are created by moving electric charges (currents) or intrinsic magnetic moments of elementary particles.
| Feature | Electric Field | Magnetic Field |
|---|---|---|
| Source | Static electric charges | Moving electric charges (currents) or magnets |
| Force on | Electric charges (static or moving) | Moving electric charges |
| Direction of Force | Parallel or anti-parallel to the electric field | Perpendicular to both the magnetic field and the velocity of the charge (given by the Lorentz force law) |
| Work Done | Can do work on a charge, changing its kinetic energy. | Does no work on a charge (since the force is always perpendicular to the velocity); only changes its direction. |
| Field Lines | Originate from positive charges and terminate on negative charges. | Form closed loops; they have no beginning or end. |
| Mathematical Representation | $\vec{F} = q\vec{E}$, where $\vec{F}$ is the force, $q$ is the charge, and $\vec{E}$ is the electric field. | $\vec{F} = q(\vec{v} \times \vec{B})$, where $\vec{F}$ is the force, $q$ is the charge, $\vec{v}$ is the velocity, and $\vec{B}$ is the magnetic field. |
| Shielding | Can be shielded by conductors. | Difficult to shield; requires special materials and configurations. |
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