Question

State Faraday's law of electromagnetic induction.

Answer 1

Faraday's law of electromagnetic induction:

1. Due to the changing magnetic field, the electromagnetic force (EMF) is induced in a circuit, and therefore, a current is produced. This is called electromagnetic induction.
2. First law: It states that whenever there is a change in magnetic flux associated with a coil, EMF is induced in that coil.
3. Second law: It states that the magnitude of EMF induced in the coil is directly proportional to the rate of change of magnetic flux associated with that coil.
4. Mathematically, it can be expressed as $\epsilon =-\frac{d\varphi }{dt}$, where $\epsilon$ is the induced EMF and $\frac{d\varphi }{dt}$ is the rate of change of magnetic flux.
5. For $n$ number of turns in the coil, the expression is given as $\epsilon =-n\frac{d\varphi }{dt}$.
6. The diagram below illustrates the generation of current in a coil due to a moving magnet, and no current is generated due to a static magnet.