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In addition to the revision notes for Inductance and Self-Induction on this page, you can also access the following Magnetism learning resources for Inductance and Self-Induction
Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
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16.9 | Inductance and Self-Induction |
In these revision notes for Inductance and Self-Induction, we cover the following key points:
Inductors are devices used to produce a desired magnetic field. The symbol of inductor is ( ). A solenoid is the most typical example of conductor.
Inductors are analogue to capacitors, which are circuit components used to store electric charges in their plates producing in this way a desired electric field between their plates as they are charged by opposite signs.
We can change the magnetic field produced in the coil by changing the value of resistance of the circuit. This can be achieved by moving the sliding contact of rheostat in another position. As a result, we will obtain the new values: R, I and B for the corresponding quantities from R0, I0 and B0 they were initially.
The induced emf produced by the solenoid (known as self-induced emf because it is not generated by the flux change due to any motion in respect to an external magnetic field), is
Since the magnetic field of a solenoid is
and the change in magnetic flux through the solenoid is
then, the self-induced emf in the inductor is
The expression inside the brackets is called inductance, L. It is measured in Henry [H]. Hence, the self-induced emf in terms of inductance is
If a current I is flowing through the turns of a solenoid (called henceforth an "inductor"), it produces a magnetic flux Φm through the central region of the inductor. As a result, we obtain for the inductance of inductor in terms of magnetic flux:
where N is the number of turns in the inductor.
There is a wide range of inductance application in modern electronic devices. Some of them include filters, sensors, transformers, electric motors, tape recorders, etc.
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