.State and explain Faraday laws. How many grams of Aluminum can be produced by electrolysis of molten alumina with a current of 1 ampere for 1 minute?
Answers
Faraday’s Laws of Electromagnetic Induction
Faraday’s Laws of Electromagnetic Induction consists of two laws. The first law describes the induction of emf in a conductor and the second law quantifies the emf produced in the conductor. In the next few sections, let us learn these laws in detail.
Faraday formulated his first law of electromagnetic induction as,
Whenever a conductor is placed in a varying magnetic field, an electromotive force is induced. If the conductor circuit is closed, a current is induced which is called induced current.
Faraday’s second law of electromagnetic induction states that
The induced emf in a coil is equal to the rate of change of flux linkage.
The flux is the product of the number of turns in the coil and the flux associated with the coil. The formula of Faraday’s law is given below:
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ε=−NΔϕΔt
Where,
ε is the electromotive force
Φ is the magnetic flux
N is the number of turns
The negative sign indicates that the direction of the induced emf and change in the direction of magnetic fields have opposite signs.
Additionally, there is another key law known as Lenz’s law that describes electromagnetic induction as well.