**What is the Unit of Electric Charge?**

The SI unit of electric charge is

**and the CGS unit of electric charge is***Coulomb (C)***. The CGS unit of charge is also known as***esu (electrostatic unit)***. Here we will know more about coulomb and statcoulomb.***Statcoulomb***In SI unit system:**

When two points charges

*q1*and*q2*are placed in a vacuum at a distance of*r*from each other, then the effective force that is working between them isIf

*q1 = q2 = 1 C*and*r = 1 m*, then*F = 9 × 109 N*. From this, we can give the following definition of electric charge**1 Coulomb:**1 Coulomb is the amount of electric charge that when placed at a distance of 1 m from another charge of the same magnitude in a vacuum experiences an electrical force of repulsion of magnitude 9 × 10

*9*N.

**In CGS unit system:**

When two points charges

*q1*and*q2*are placed in a vacuum at a distance of*r*from each other, then the effective force that is working between them isIf

*q1 = q2 = 1 statcoulomb*and*r = 1 cm*, then*F = 1 dyne*. From this, we can give the following definition of electric charge**1 Statcoulomb:**1 statcoulomb is the amount of electric charge that when placed at a distance of 1 cm from another charge of the same magnitude in a vacuum experiences an electrical force of repulsion of magnitude 1 dyne.

**Relation between 1 Coulomb and 1 Statcoulomb:**

*1 Coulomb (C) = 3 × 109 esu (electrostatic unit). or 1 Coulomb (C) = 3 × 109 Statcoulomb*.

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