1. Tardigrade
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  3. Physics
  4. Statement I The self-induced emf is also called the back emf. Statement II The self-induced emf opposes any change in the current in a circuit.

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Q. Statement I The self-induced emf is also called the back emf.
Statement II The self-induced emf opposes any change in the current in a circuit.

Electromagnetic Induction

Solution:

The self-induced emf is also called the back emf as it opposes any change in the current in a circuit. Physically, the self-inductance plays the role of inertia. It is the electromagnetic analogue of mass in mechanics. So, work needs to be done against the back emf $(\varepsilon)$ in establishing the current. This work done is stored as magnetic potential energy.