## Monday, March 20, 2017

### Properties of Electric Charges Video Lesson

Electric charge is the property of a particle of certain mass due to which it can either attract the opposite charge or repel the similar charge.Charges are classified as positive and negative and many bodies around  are neutral which means they have equal and opposite charges.

When one body with excess charges is rubbed with the other, there is transfer of electrons from one body to other. The body lost electrons will have excess positive charges and the body that gained electrons will have excess electrons. Thus the body that gained electrons is negatively charged and the body that lost electrons is positively charged.

Thus body that is positively charged losses a small portion of mass due to loss of electrons and the body  that gained electrons is not only negatively charged but its mass is also  slightly increases.

Properties of Charges

Similar charges repel each other and opposite charges attract each other. This force of attraction obeys inverse square law. According to it the force of attraction or repulsion is inversely proportional to the square of distance of separation. It is a long distance range force. Further properties are explained in the video lesson below.

Number of electrons in one coulomb charge

We know that electron is treated like a fundamental charge and it is measured in a unit called coulomb. We also know that the charge is always available as integral multiples of charge of electron and this concept is called quantization of the charge. Taking that concept into consideration, we can find the number of electrons in one coulomb charge as shown in the video lesson below.

Methods of electric charging

We can charge the body by rubbing one body with the other. This is called charging a body by friction and during the rubbing, one body loose the electrons and the other body gains the electrons. We can also charge a body by conducting where we are passing the charge through the materials which has the ability to pass the current. We can also charge a body by keeping the body in contact. In that case excess charges from one body to other get transferred until there is some potential difference between them. It is explained in the following video lesson.

Charging a body by induction

Induction is the phenomenon of rearrangement of charges in a neutral body in the presence of a charged body. This separation of charges is called polarisation of charges and we can get a body charged using induction method with out getting in touch and contact with the body. It is explained in the following video lesson below.

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