Important Points about Charges

Description:

• One coulomb charge is that quantity of charge which when given to 2 particles placed at 1 meter distance exerts a force of 9 × 10⁹N on each other.

• Charge on one electron or fundamental charge of electron equal 1.6019 × 10^-19C.

• 1coulumbs charge contains 6.243 × 10¹⁸ electron.

• Coulumbs is a large quantity so its smallest quantity we take as micro coulomb (Micro = 10^-6C).

• Electric charges is not a fundamental quantity.

• 1 coulumbs charge is defined as 1 amper current flouring through a wire in 1 sec.

• In SI system electric current is taken as fundamental quantity.

• In CGS system Fq₁q₂/r² and E is taken as 1.

• In CGS system q₂ are called electrostatic charge or stat coulumbs.

• When two similar charge is placed at a distance of 1 cm exertsa force of 1 dyne between them is called stat coulumbs.

• 1 AB coulumbs = 3 × 10¹⁰esu (electro Static Unit)