As a physics student, you may or may not have come across Lenz’s law.
I created this post so that you can understand the basics, because that’s what all examiners in Nigeria want.
Lenz’s law states that the induced current flows in such a direction as to oppose the motion producing it.
This is often called Faraday’s second law of electromagnetic induction.
The law gives the direction of the induced emf when the current in the primary coil is increased.
The direction of the induced current in the secondary coil will be in the opposite direction.
The direction of the induced current in such that it tries to oppose the movement of the magnet towards the solenoid.
This law deals with an electric circuit, a solenoid and a magnet.
The factors on which the magnitude of the induced emf depends on the following:
1.The strength of the magnet (magnetic flux or lines of force linking the circuit.)
2. Number of turns in the coil (solenoid)
3.The distance between the magnet and the coil.
4.The surface area of the coil.
5.The relative speed between the magnet and the coil.
When a metallic sheet, either in a moving magnetic field or in a changing magnetic field occurs, an induced current flows. This current is called “eddy current”.
The effect can be reduced by increasing the resistance of the eddy current path by:
1.Using a pack of iron dust.
2.Laminating the core.
3.Using a bundle of iron wires.
In waec, neco, jamb, etcetera (most examinations in Nigeria), In physics, some questions are taken from this topic.
They only need you to understand the simple basics of this law.
Faraday’s 2nd law of electromagnetic induction (Lenz’s law) is not hard to understand and remember during your exams.
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