What are Basic Definitions In Electromagnetism ?

 Basic Definitions In Electromagnetism

There are so many definitions available in electromagnetism and these terms are very important in electrical and electronics engineering. So we will take a look and understand all one by one and get some knowledge on it.

Please find all definitions as below, 

Law of Magnetic Forces :-  

The quantitative expression for the magnetic force between two isolated point poles. It may be noted here that, in view of the fact that magnetic poles always exit in pairs, it is impossible, in practice, to get an isolated pole. The concept of an isolated pole is purely theoretical. However, poles of thin but long magnet may be assumed to be point poles for all practical purposes. By using torsion balance, he found that the force between two magnetic poles placed in a medium is,

• Directly proportional to their pole strengths,
• Inversely proportional to the square of the distance between them, and 
• Inversely proportional to the absolute permeability of the surrounding medium.

Magnetic Field :-

The space around the poles of a magnet is called the magnetic field and is represented by magnetic lines of force.

Magnetic Flux :-

The total number of magnetic lines of force in a magnetic field is called magnetic flux.

Magnetic Flux Density (B) :-

The magnetic flux density at any point is given by the flux passing per unit area at that point, through a plane that is at right angles to the flux.

Magnetic Circuit :-

It is defines as the path which is followed by the magnetic flux.

Magnetomotive Force (M.M.F.) :-

M.M.F. is defines as the magnetic force, which creates magnetic flux in a magnetic material. OR Magnetizing force may also be defined as the number of ampere turns produced per unit length of the magnetic path.

Reluctance (S) :-

It is the property of a magnetic material by virtue of which it opposes the creation of magnetic flux in it.

Permeability :-

It can be defined as the ability of a material to conduct magnetic flux through it.

• Absolute Permeability :- The flux density induced in the magnetic material per unit magnetizing force.
• Relative Permeability :- The permeability of free space or air is taken as reference. Thus the relative permeability of free space or air is taken as unity.

For any other magnetic material, it is defined as the ratio of the flux density induced in the magnetic material of a particular shape and size to the flux density induced in free space or air of the same shape and size, when the same magnetizing force is applied.

Magnetizing Force or Magnetic Field Intensity :-

The magnetic field strength or field intensity (H) at any point is defined as the force experienced by a unit north pole, when placed at that point.

Leakage Flux :-

It is defined as the magnetic flux which does not follow the particularly intended path in a magnetic circuit.

Fringing :-

The useful flux when sets up in the air gap, it tends to bulge outwards, because of this bulging, the effective area of the air gap increases and the flux density of the air gap decreases. This effect is known as fringing. 

Electromagnetic Induction :-

Electromagnetic Induction or Induction is a process in which a conductor is put in a particular position and magnetic field keeps varying or magnetic field is stationary and a conductor is moving. This produces a Voltage or EMF (Electromotive Force) across the electrical conductor.

Faraday's Laws of Electromagnetic Induction :-

• First Law :- Whenever the flux linking a coil or circuit change and e.m.f. is induced in it.
• Second Law :- The magnitude of the induced e.m.f. in a coil is directly proportional to the rate of change of flux linkages.

Lenz's Law :-

This law states that the direction of induced e.m.f. is such that the current produced by it sets up a magnetic field opposing the motion or change producing it.

Dynamically Induced E.M.F. :-

When the magnetic field is stationary and the conductor is in motion, the e.m.f. induced is called dynamically induced e.m.f.

Statically Induced E.M.F. :-

When a conductor is stationary and the magnetic field is moving or changing, the e.m.f. induced is called statically induced e.m.f. may be :

• Self-Induced E.M.F. :- The e.m.f. induced in a coil due to the change of its own flux linked with it is called self-induced e.m.f.

• Mutually-Induced E.M.F. :- The e.m.f. induced in a coil due to the change of flux produced by another neighboring coil linking to it, is called mutually induced emf.   

Energy Stored in a Magnetic Field :- 

The energy stored in a magnetic field is equal to the work needed to produce a current through the inductor.

Energy Density :-

The energy stored per unit volume or the amount of energy stored in a given system. 

            We always update this post, so keep in touch with us to get the latest information's, and we hope you enjoyed reading this post.

Another Posts :- 

1. Text Editing and Formatting a Document Using Microsoft Word
   
2. WHAT IS WINDOWS ACCESSORIES EXPLAIN IN DETAIL
3. WHAT IS OPERATING SYSTEM? EXPLAIN TYPES OF OS, FEATURES
   
4. WHAT ARE FUNCTION KEYS IN EXCEL - KEYBOARD FUNCTION KEYS - F1 TO F12
   
5. MICROSOFT EXCEL SHORTCUT KEYS
   
6. WHAT IS CHART IN EXCEL - TYPES OF CHART - HOW TO MAKE CHART IN EXCEL - HOW TO CHOOSE CHARTS IN EXCEL
7. EXPLAIN BASICS WIRING AND OVERHEAD TRANSMISSION & DISTRIBUTION LINE