Electromagnetic Induction and Alternating Currents
Faraday's law, Lenz's law, self/mutual inductance, AC circuits, LC resonance, transformer.
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Take a full mock →Q1 · Electromagnetic Induction and Alternating Currents · EASY
Faraday's law of electromagnetic induction states that the induced EMF in a circuit equals:
Q2 · Electromagnetic Induction and Alternating Currents · MEDIUM
Through an inductor of inductance 2 H, current changes from 1 A to 5 A in 2 s. The magnitude of induced EMF is:
Q3 · Electromagnetic Induction and Alternating Currents · EASY
An AC source has peak voltage 220 V. Its rms voltage is approximately:
Q4 · Electromagnetic Induction and Alternating Currents · EASY
A transformer has 200 turns in the primary coil and 800 turns in the secondary coil. If the primary voltage is 50 V, what is the secondary voltage? (Assume an ideal transformer)
Q5 · Electromagnetic Induction and Alternating Currents · MEDIUM
A coil of self-inductance 5 H and resistance 10 Ω is connected to a 20 V battery. What is the time constant of the circuit, and what will be the final steady-state current?