Electromagnetism is a branch of Physics, deals with the electromagnetic force that occurs between electrically charged particles. Electromagnetic force is one of the four fundamental forces and exhibits electromagnetic fields such as magnetic fields, electric fields and light. It is the basic reason electrons bound to the nucleus and responsible for complete structure of nucleus.
Electromagnetism is a process where magnetic field is created by introducing current in the conductor. When a conductor is electrically charged it generates magnetic lines of force of conductor. For example, if current i.e., positive charges moving in a wire, it produces magnetic field along the wire and the direction of magnetic lines, and force can be determined using Right Hand Rule. see the image for detailed explanation.
Explanation with an Example
We have seen what happens when a conductor is electrically charged. Now, lets see what happens if we place conductor in between magnetic field.
When a conductor is placed or moved through the magnetic field it generates voltage i.e., electricity. This principle is called Electromagnetic Induction. The voltages generated will be based the speed of conductor moving through the electric field. Faster the speed of conductor, greater the induced electricity or voltage.
Faraday’s Law states that whenever there is relative motion between magnetic field and conductor, the flux linkage changes and this change in flux induces a voltage across the coil.
Explanation with an example
DC Generator works on the principle of Faraday’s Law Electromagnetic Induction. It is a system that converts mechanical energy into electrical energy.
In the above figure, A rectangular conductor width sides is placed in between a magnetic field. When the rectangular conductor rotates in between magnetics, it cuts magnetic field thereby causing e.m.f.
Practise This Question
|CBSE Physics Syllabus Class 6||CBSE Physics Syllabus Class 7||CBSE Physics Syllabus Class 8||CBSE Physics Syllabus Class 9||CBSE Physics Syllabus Class 10|