Self induction is the property by which a coil
Correct answer: B. opposes any change in the current flowing through itself
- A. induces an emf in a neighbouring coil
- B. opposes any change in the current flowing through itself
- C. stores charge like a capacitor
- D. converts alternating current to direct current
Explanation
A changing current changes the coil's own flux, which by Lenz's law induces a back emf opposing that change, so an inductor resists sudden rises and falls of current. This is why a large spark appears when an inductive circuit is broken. Inducing an emf in a neighbouring coil is mutual induction instead.
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About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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