a) Faradays formulate two basic laws of electromagnetic induction based
Ellie Benjamin
Answered question
2022-07-15
Explain Faradays experiment and at the end depending on the experiment, state Faradays laws.
b) Explain how one can increase the emf induced in the coil by change in magnetic field.
c) State Lenz law.
Answer & Explanation
Salma Bradley
Beginner2022-07-16Added 13 answers
Faraday’s 1st law:
Experiment description:
When a bar magnet is brought closer or farther from the conducting loop, an emf induces in the loop. So when the moving bar magnet brings closer to the loop, due to the change in the intensity of the magnetic field (i.e., more lines of forces passes through the loop) an emf induces in the loop. And due to this emf, the current flows through the loop and it is called induced current.
Statement of the 1st law: The electromotive force (emf) is induced in the conductor placed in the varying magnetic field and if the conductor is closed the current corresponds to the emf flows through it and it is called an induced current.
Statement of the 2nd law: The magnitude of the emf induced is directly related to the rate change of the flux linkage with the coil/loop.
Mathematically,
Here, is the emf, is the magnetic flux.
sweetymoeyz
Beginner2022-07-17Added 8 answers
It is evident from the above formula that by changing flux (that is nothing but the product of the magnetic field (B) and the loop’s area), the emf induces in the loop.
So, if a bar magnet is brought closer to the loop, the flux penetrating the loop increases thereby increases the induced emf.
(c)
The negative sign in the above-stated formula signifies the Lenz law.
The Lenz law says that the induced current flow such a way to oppose the pre-existing magnetic field by producing its own magnetic field in the opposite direction.
Physical significance: It signifies the conservation of energy.
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