**electric charge**,

**unit of charge**,

**types of electric charge**, etc.

The **electric charge **or
simply **charge** is the subatomic
property of all matter. The electric charge is denoted by “**Q**” or “**q**” and is measured in **coulomb**.
Basically, the electric charge is the property by virtue of which a substance
shows electrical behavior.

**negative**” and the charge carried by a proton is “

**positive**”. The magnitude of this charge carried either by proton or electron is the same and is equal to `\1.6×10^{-19}` C.

**The important points about the electric charge are:**

- In 1 coulomb of charge, the number of electrons (
*n*) is

`\n=\frac{1}{1.6×10^{-19}}=6.24×10^{18}" "e^-`

- The charge is quantized, i.e. the charges that occur in nature are always the integral multiples of electronic charge. That means, there is no ½ C, 3/2 C, etc. existing in nature.

Charge, *Q = ne ; *Where, n = 0, 1, 2, ...

- The charge of a given system is always conserved, i.e. the
**law of conservation of charge****states that the charge cannot be created or cannot be destroyed**. Therefore, the algebraic sum of electric charges in a system does not change.

**Properties of Electric Charge**

The following are the two important properties of electric
charge:

- Like charges, i.e. positive and positive charges or negative and negative charges, repel each other.
- Unlike charges, i.e. positive and negative charges, attracts each other.

**Numerical Example** - How much electric charge is flowing in a circuit where `\1.37×10^{15}` electrons move past a given point.

**Solution** - Given data,

`\"Number of electrons",n=1.37×10^{15}`

`\∵"Charge",Q = n e`

`\∴Q=(1.37×10^{15})×(1.6×10^{-19})`

`\Q=2.192×10^{-4}" C"`

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