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Inductors - Technical MCQs

Q1:

When current in an inductor starts to change, it cannot react instantly due to:

A fixed coil resistance

B eddy current generation

C applied emf of the circuit

D the counter emf of the coil

ANS:D - the counter emf of the coil

Inductor reacts against to the current. Applying voltage to its terminals it will produce a current that will then creates a magnetic field. This E-field tend to 'stop' the current.