Can time varying magnetic field generate induced emf explain?
Even when there is a single circuit carrying a current, the magnetic field of the circuit links with the circuit itself. If the current happens to be time varying, an emf will be generated in the circuit to oppose the change in the flux linked with the circuit.
What causes emf to induce?
Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be “induced” in the coil. The induced emf in a coil is equal to the negative of the rate of change of magnetic flux times the number of turns in the coil. It involves the interaction of charge with magnetic field.
Can a magnetic field induce an electric field?
A changing magnetic flux induces an electric field. Both the changing magnetic flux and the induced electric field are related to the induced emf from Faraday’s law.
What is the relationship between emf and magnetic field?
An emf induced by motion relative to a magnetic field is called a motional emf. This is represented by the equation emf = LvB, where L is length of the object moving at speed v relative to the strength of the magnetic field B.
Why does time varying electric field produce magnetic field?
Explanation: A time varying electric field produces a magnetic field. This phenomenon is called Ampere-Maxwell equation. According to Maxwell, the total current is equal to the sum of current due to flow of electrons and due to time varying electric field.
What is induced magnetic field?
Developed by German physicist Heinrich Lenz Lenz’s law: the induced current in a loop is in the direction that creates a magnetic field that opposes the change in magnetic flux through the area enclosed by the loop. The induced current tends to keep the original magnetic flux through the circuit from changing.
How is emf related to electric field?
In nature, emf is generated when magnetic field fluctuations occur through a surface. In an electrical generator, a time-varying magnetic field inside the generator creates an electric field via electromagnetic induction, which creates a voltage difference between the generator terminals.
Why the induced emf is at maximum when the coil is parallel to the magnetic field?
When the plane of the armature is parallel to the lines of force of magnetic field, the rate of change of magnetic flux linked with it is maximum. Therefore, the e.m.f. induced in the armature in this orientation is maximum.