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How the process of change in magnetic flux causes induced emf?
Wiki User
∙ 13y ago
According to Faraday's laws of electromagnetic induction, whenever a varving flux link with a conductor an emf is induced.
Wiki User
∙ 13y ago
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What is the emf induced at zero field current.and what does it signify?
EMF is the voltage across a coil (or motor) due to changes in the magnetic field. If you change the current the coil will generate a voltage (in the opposite direction of the current). So it is not the field but the change that matters.
What is principle of strain gauge?
change in temperature causes change in pressure
Why do distant objects ripple on a hot day?
Distance objects can be seen to "ripple" on a hot day because of refraction. As light from a distance object makes the trip to the observer, it passes through air of slightly varying densities. This causes it to "change course" to a degree, which is refraction. It is this thermally induced refraction that is responsible for the "ripple" we see, and for the mirage we sometimes hear about.
What is mutual induced emf?
The property of one coil due to which it oposses the change of current in the other coil is called mutual inductance b\w two coil.
What causes seasonal change on the earth?
the rotation of the earth around the sun
Can DC be used for transformer?
Basis of transformer is change in current. Whenever current flows it causes magnetic field. Current flow in primary coil causes magnetic field around secondary. Since current is changing as in the case of AC, magnetic filed also changes. As per Faraday's law change in magnetic field causes induced voltage at secondary coil. In case of DC there wont be any change in current, thus no change in magnetic field leading to no induced voltage.
What are the cause of induced emf?
A change in current causes a voltage to be induced into an inductive circuit, which opposes that change of current. This is because the change in current is accompanied by a change in magnetic flux which 'cuts' the conductors and induces a voltage into them.
What is self induced?
When a current in a coil increases or decreases, there is a change in magnetic flux linking the coil,an e.m.f. is induced. This is called self induced e.m.f. and the process is called self induction.
What is the statment of lenz law?
The direction of an induced emf or current is such that the magnetic field created by the induced current opposes the change in magnetic flux that created the current.
What does the lenz law state?
The direction of an induced emf or current is such that the magnetic field created by the induced current opposes the change in magnetic flux that created the current.
What are 5 examples of magnetic forces?
polarized atomic regions (a magnetic substance) electron-induced magnetism (induction) radio-induced magnetism (radio waves induce current on a conductor that in turn is creates electron induced magnetism) reverse-magnetostriction (the opposite of the effect that states magnetism causes metal to change shape on the atomic level) a flawless LRC circuit
Why does the induced current opposes the original cause in lenz's law?
The induced current creates a magnetic field that opposes the original cause of it because it is trying to resist the change in magnetic field in the area and the only way to do that is to create an equal and opposite magnetic field which leads to the induced current.
Difference between statically and dynamically induced emf?
STATICALLY INDUCED EMFThe emf induced in a coil due to change of flux linked with it (change of flux is by the increase or decrease in current) is called statically induced emf.Transformer is an example of statically induced emf. Here the windings are stationary,magnetic field is moving around the conductor and produces the emf.DYNAMICALLY INDUCED EMFThe emf induced in a coil due to relative motion of the conductor and the magnetic field is called dynamically induced emf.example:dc generator works on the principle of dynamically induced emf in the conductors which are housed in a revolving armature lying within magnetic field
Does constant magnetic flux in a coil induce a current in it?
Faraday's Law: the E.M.F. induced in a conductor [the current is caused by the E.M.F.] is directly propotional to the rate of change of magnetic flux linkage.A constant magnetic flux isn't changing, so the rate of change is zero and the induced E.M.F is zero. No E.M.F. = no current.
How Michael Faraday discovered electromagnetic induction?
Move a magnet into a coil, and a voltage is induced into that coil, causing a galvanometer to deflect. Withdraw the magnet, and the galvanometer will deflect in the opposite direction, indicating that the induced voltage depends upon the direction of motion of the magnet.
What is the process by which Earth's magnetic poles change places?
Magnetic reversal
What are the reasons why a current is induced in a coil?
Current is not induced into a coil. It's voltage that is induced into a coil. If the coil is connected to a load, or even short circuited, then a current will flow as a result of the induced voltage -but it's the voltage, not the resulting current, that's induced!Voltage is induced into a coil because the the changing magnetic field, due to the change in current (0 to Imax or vice versa) applied to that coil. The process is called 'self induction'.
