Question

What is an ideal inductor?

Answer 1

1. An inductor is an electric device that opposes any change of electric current flowing through it. The working principle is the Lenz law.
2. Lenz’s law states that the induced electromotive force with different polarities induces a current whose magnetic field opposes the change in magnetic flux through the loop in order to ensure that the original flux is maintained through the loop when current flows in it.
3. The mathematical relation for Lenz's law:
   $\mathrm{emf}=-\mathrm{N}\frac{\mathrm{d\varphi }}{\mathrm{dt}}$
   Where, $\mathrm{N}$ is the number of loops
   $\mathrm{d\varphi }$ is the change in magnetic flux
   $\mathrm{dt}$ is the change in time.
4. The inductance of an inductor is denoted by L
5. The SI unit of inductance is Henry$\left(H\right)$
6. Every inductor has some resistance associated with it. Hence some heat is dissipated when it is working.
7. An ideal inductor is one that does not have any resistance. Hence there is no heat dissipation for an ideal inductor.
8. It purely has inductance. Hence it is also called a pure inductor.
9. The efficiency of the ideal inductor is $100\%$