Electric Charge

We can define Electric charge as the physical properties of matter which allows it to experience a special kind of force when kept under the influence of electromagnetic field.

The study of electricity is divided 3 different branches which are:

  • Electrostatics: It is the study of the force that acts between charges.
  • Electromagnetism: It is the study of the forces that acts on the charges that are in motion.
  • Electric Current: It is the study of the form of energy that are associated with the flow of charge.

Types of electric charge

Two kind of electric charges are there

  • positive(+) charge
  • negative(-) charge
  • Neutral do not refer to the third type of charge, but it is a region between the positive and negative charges.

Suppose if there are identical positive and negative charges and their sum will be zero. This means they are electrically neutral.

Some of the Methods of Charging

  • Induction
  • Conduction
  • Triboelectricity

The Like charges usually repel each other and unlike charges attract each other. The SI unit for the electric charge is Coulomb and is equal to around  6.242×1018 e. The value of charge of electron is −1.602×10−19 C. Coulomb is described as the quantity of the charge passing through an cross-section of electrical conductor which carries one ampere per second.

The symbol used to denote a quantity of electricity is Q and it is directly calculated with an electrometer. When charged particles were produced by rubbing suitable materials, then we were known about the existence of charges. These facts can be demonstrated by simple examples. Take a comb and rub it on your head, place the comb near to the pieces of paper placed on the table. You will see the comb starts to attract the paper pieces.

According to the Franklin convention, the electric charge present on the comb is positive charge and the charge present on the paper pieces is negative electric charge. The comb which attracts the paper pieces contains positive charge and any object which repels the comb is negatively charged.

Explore more on the concept and get NCERT Solutions for Electric Charge and Fields that aids conceptual learning of concepts in depth.

Practise This Question

What charge is acquired by the glass rod when it is rubbed with a piece of silk?