Question

This property of the coil due to which it opposes any increase or decrease or current of flux through it, is known as

• A. Self inductance
• B. Mutual inductance
• C. Dynamic inductance
• D. Static inductance

Hint:

Think of self-inductance as "electrical inertia":
- Mechanical mass opposes any change in velocity (\(F = m \cdot a\)).
- Self-inductance opposes any change in current (\(e = -L \cdot \frac{di}{dt}\)).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
According to Faraday's law of electromagnetic induction, any change in the magnetic flux linking a circuit induces an electromotive force (e.m.f.) in that circuit.
According to Lenz's law, the direction of this induced e.m.f. is always such that it opposes the change in magnetic flux that produced it.

Step 2: Detailed Explanation:
Let us analyze the electrical properties of an inductor coil:
- When an electric current flows through a coil, it generates a magnetic field around the coil, creating a magnetic flux that links the turns of the coil.
- If the current flowing through the coil changes (either increasing or decreasing), the associated magnetic flux also changes.
- This changing magnetic flux induces an e.m.f. directly within the same coil.
- According to Lenz's law, this induced e.m.f. (called back e.m.f.) opposes the change in the driving current:
- If the current is increasing, the induced e.m.f. acts in the opposite direction to oppose the increase.
- If the current is decreasing, the induced e.m.f. acts in the same direction to oppose the decrease.
- This self-opposing property of a single coil is called self-inductance (\(L\)).
- It is often described as the electromagnetic equivalent of mechanical inertia.
- Mutual inductance involves the induction of an e.m.f. in a neighboring secondary coil due to a changing current in a primary coil, which differs from this single-coil property.

Step 3: Final Answer:
The property of a coil that opposes any change in current or flux through itself is self-inductance.