Electric Charge

Electric Charge

1. There are two kind of electric charge, namely the positive charge and the negative charge.
2. Like charge repel each other.
3. Unlike charge attract each other.
4. A neutral body can be attracted by another body which has either positive or negative charge.
5. The SI unit of electric charge is Coulomb (C).
   Example
   Charge of 1 electron = -1.6 x 10^-19C
   Charge of 1 proton = +1.6 x 10^-19C

Charge and Relative Charge

Sum of Charge

Sum of charge
= number of charge particles × charge of 1 particle
$$Q=ne$$

Example:
Find the charge of 2.5 x 10¹⁹ electrons.
(Charge of 1 electron is   -1.6 x 10^-19C)

Answer:
Number of electrons, n = 2.5 x 10¹⁹
Charge of 1 electron, e = -1.6 x 10^-19C
$$\begin{array}{l}Q=ne\\ Q=(2.5\times {10}^{19})(-1.6\times {10}^{-19})\\ Q=-4C\end{array}$$