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# COULOMB'S THEOREM

 The proposition that the intensity of an electric field near the surface of a conductor is equal to the surface charge density on the nearby conductor surface divided by the absolute permittivity of the surrounding medium.

## Related Terms

### ELECTRIC IMAGE

A fictitious charge used in finding the electric field set up by fixed electric charges in the neighborhood of a conductor; the conductor, with its distribution of induced surface charges, is replaced by one or more of these fictitious charges. Also known as image. electric induction See electric displacement.

### DEPLETION LAYER

An electric double layer formed at the surface of contact between a metal and a semiconductor having different work functions, because the mobile carrier charge density is insufficient to neutralize the fixed charge density of donors and acceptors. Also known as barrier layer (deprecated); blocking layer (deprecated); space-charge layer.

### CONTACT ELECTRICITY

An electric charge at the surface of contact of two different materials. contact electromotive force See contact potential difference. contact gear ratio See contact ratio.

### CHARGE DENSITY

The charge per unit area on a surface or per unit volume in space.

### ELECTROSTATIC FORCE

Force on a charged particle due to an electrostatic field, equal to the electric field vector times the charge of the particle.

### ELECTRIC POTENTIAL

The work which must be done against electric forces to bring a unit charge from a reference point to the point in question; the reference point is located at an infinite distance, or, for practical purposes, at the surface of the earth or some other large conductor. Also known as electrostatic potential; potential. Abbreviated V.

### ELECTRIC DIPOLE MOMENT

A quantity characteristic of a charge distribution, equal to the vector sum over the electric charges of the product of the charge and the position vector of the charge.

### COULOMB FIELD

The electric field created counterblow hammer forces they exert on one another.

### MIRAGE

An optical phenomenon in which objects appear distorted, displaced (raised or lowered), magnified, multiplied, or inverted due to varying atmospheric refraction when a layer of air near the earth’s surface differs greatly in density from surrounding air.

### HORIZONTALLY POLARIZED WAVE

A plane polarized electromagnetic wave in which the electric field vector is in a horizontal plane.

### Related questions

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