Electromagnetism is first discovered by Oersted.
Electromagnetic induction first found by Michael Faraday.
Electromagnetism is the phenomenon in which magnetism is produced when electric current flows in a straight wire. This is the conversion of electrical energy into magnetic energy.
But electromagnetic induction is the phenomenon in which electric current is produced in a wire as it cuts the magnetic lines of force. Here in the presence of magnetic energy mechanical energy gets converted into electrical energy.
The former is applied in fans, motors etc.
The later is utilised in generators.
In an electrical bell, electromagnetism plays an important role.
In case of choke, electromagnetic induction serves in a nice way.
Former has Biot-Savart law, Ampere's circuital law, Lorentz force law, Fleming's left hand rule, Right hand thumb rule.
The latter has Faraday's laws, Lenz law, Fleming's right hand rule.
you might have learned a lot about electric circuit. you must be knowing Ohm's law. where there is a simple equation.
V=I*R
where V= potential difference across a resistor.
I= current flowing through the resistor
R= resistance
thus we can write this equation in this manner as well
I=V/R (1)
There is similarity in between electric circuit and magnetic circuit.
@=AT/S (2)
@= magnetic flux
AT= total ampere turns
S= reluctance of the magnetic path
Here you can see that when we compare 1 and equation 2 there seems a lot of similarity in between them. in equation no.2 @ is working as I in equation no. 1.
S reluctance is working as R in equation no. 1
But what are the difference in between them.As both of them seems to be similar but they are different from each others.
1. Electrons flow in resistance or wire when electric current flows in it. But there is not such flow in magnetic flux. Actually there is establishment of magnetic flux in the space where they had to be spread.
2. Till there is flow of electric current in the resistor there shall be loss of energy through the resistor. But in case of magnetic flux there is no loss of energy it is just established in the space.
Magnetic induction and electromagnetic induction are used pretty much interchangably. Magnetic induction is really electromagnetic induction. One of the four fundamental forces in the universe is the electromagnetic force. Not the electrical force or the magnetic force, but the electromagnetic force. And magnetic induction is just another term for electromagnetic induction.
they dont send out magnetic signals
Change in magnetic flux.iechange in magnetic field (B).change in the area vector/ area of magnetic field under the closed circuit (A).The angle between area vector and magnetic field .......xomagnetic flux = cosxo . A . B
There is a motor in a generator which carries out this electromagnetic induction,as we switch on the generator the magnetic field lines between that motor get cuts off by the rotating coil which cause change in flux and change in flux cause induced emf,cue to emf at different points of coil cause current to get flow and then generator will get on.
The wavelength
In an electric magnet there is an ordinary metal used which when you run a current through it, induces a magnetic field, the permanent magnet (usually made of lodestone) contains particles which are already arranged in a manner that produces a magnetic field.
Electromagnetic Induction.
When magnetic flux lines of force are cut by induced voltage between magnetic and electric currents. Electromagnetic induction is created.
It is defined as when the conductor is placed between the magnetic field and since when the conductor cuts the path of the magnetic field emf is produced... The basic Faraday's Law of electromagnetic induction...
they dont send out magnetic signals
Change in magnetic flux.iechange in magnetic field (B).change in the area vector/ area of magnetic field under the closed circuit (A).The angle between area vector and magnetic field .......xomagnetic flux = cosxo . A . B
Slip is referred to as the difference between the speed of the rotor and the speed of the rotating magnetic field in the stator of the induction motor. Speed of the rotor=n(1-s) Speed of the rotating magnetic field= f/p
When there is relative motion between a magnet and a coil of wire, an electric current starts flowing in the coil. This phenomenon is called electromagnetic induction.When lines of a magnetic field cross the line of an conductor, electric current is induced in it.
There is a motor in a generator which carries out this electromagnetic induction,as we switch on the generator the magnetic field lines between that motor get cuts off by the rotating coil which cause change in flux and change in flux cause induced emf,cue to emf at different points of coil cause current to get flow and then generator will get on.
There are no purely magnetic waves.
The opposition to AC current flow in a circuit due to induction is called inductive reactance.The process of generating electrical current in a conductor by placing the conductor in a changing magnetic field is induction or just induction.
In an induction motor, power is supplied to the rotor using a changing magnetic flux i.e. without any true conductive contact. Similarly, in a transformer, the power is transferred from the primary coil to the secondry one using a varying magnetic flux and the plates have no physical linkage. Hence, the similarity between an induction motor and a transformer is very basic i.e. they both use the phenomenon of electromagnetic induction to transfer power from one part to another.
The line of force or Flux between a north and south pole of a magnet are cut by rotating conductors. This induces a voltage into the conductors. This is referred to as electromagnetic induction.