# Statcoulomb

**esufranklinelectrostatic unitFranklin (unit)statC**

The statcoulomb (statC) or franklin (Fr) or electrostatic unit of charge (esu) is the physical unit for electrical charge used in the esu-cgs (centimetre–gram–second system of units) and Gaussian units.wikipedia

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### Gaussian units

**Gaussiancgs-Gaussian unitsGaussian-cgs units**

This repulsion is governed by Coulomb's law, which in the Gaussian-cgs system states:

On the other hand, in Gaussian units, the unit of electrical charge (the statcoulomb, statC) can be written entirely as a dimensional combination of the mechanical units (gram, centimetre, second), as:

### Centimetre–gram–second system of units

**CGScgs unitsCGS unit**

The ESU unit of charge, franklin (Fr), also known as statcoulomb or esu charge, is therefore defined as follows: "two equal point charges spaced 1 centimetre apart are said to be of 1 franklin each if the electrostatic force between them is 1 dyne."

### Coulomb's law

**Coulomb forceelectrostatic forceCoulomb interaction**

This repulsion is governed by Coulomb's law, which in the Gaussian-cgs system states:

### Unit of measurement

**unitunits of measurementweights and measures**

### Electric charge

**chargeelectrical chargecharged**

Performing dimensional analysis on Coulomb's law, the dimension of electrical charge in cgs must be [mass] 1/2 [length] 3/2 [time] −1.

### Speed of light

**clight speedspeed of light in vacuum**

The number is 10 times the value of the speed of light expressed in meters/second.

### Dyne

**dyndyne-centimeters**

The statcoulomb is defined as follows: if two stationary objects each carry a charge of 1 statC and are 1 cm apart, they will electrically repel each other with a force of 1 dyne.

### Dimensional analysis

**dimensiondimensionsdimensionally equivalent**

Performing dimensional analysis on Coulomb's law, the dimension of electrical charge in cgs must be [mass] 1/2 [length] 3/2 [time] −1.

### International System of Units

**SISI unitsSI unit**

(This statement is not true in SI units; see ).

### Fine-structure constant

**fine structure constant137coupling constant**

In electrostatic cgs units, the unit of electric charge, the statcoulomb, is defined so that the Coulomb constant,

### Benjamin Franklin

**Ben FranklinFranklinFranklin, Benjamin**

The CGS unit of electric charge has been named after him: one franklin (Fr) is equal to one statcoulomb.

### Debye

**DCoulomb-metre**

It is defined as 1 statcoulomb-centimeters.

### Electromotive force

**EMFelectromotive force (EMF)ℰ**

Electromotive force in electrostatic units is the statvolt (in the centimeter gram second system of units equal in amount to an erg per electrostatic unit of charge).

### List of scientific units named after people

**Scientific unitsScientific units named after people**

### Roentgen (unit)

**roentgenröntgenroentgens**

The roentgen has its roots in the Villard unit defined in 1908 by the American Roentgen Ray Society as "the quantity of radiation which liberates by ionisation one esu of electricity per cm 3 of air under normal conditions of temperature and pressure."

### Buckingham (unit)

**buckinghambuckinghams**

It is defined as 1 statcoulomb-centimetre 2.

### Bond dipole moment

**dipole momentdipole momentspolarity**

Bond dipole moments are commonly measured in debyes, represented by the symbol D, which is obtained by measuring the charge \delta in units of 10 −10 statcoulomb and the distance d in Angstroms.

### Abampere

**Bibiot**

In these other systems, the abampere is not one of the units; the "statcoulomb per second" or statampere is used instead.

### Absorbed dose

**dosedose rateabsorbed radiation dose**

At the first ICRU meeting it was proposed that one unit of X-ray dose should be defined as the quantity of X-rays that would produce one esu of charge in one cubic centimetre of dry air at 0 °C and 1 standard atmosphere of pressure.

### List of eponyms (A–K)

**List of eponymsList of eponyms (A-K)**

### Electrostatic units

**electrostatic system of unitselectrostatic setelectrostatic system**