Q1 · medium · AI-verified
Which of the following devices works on the principle of mutual induction?
- Capacitor
- Electric motor
- Transformer
- Galvanometer
Q2 · hard · AI-verified
The magnetic flux through a stationary loop of resistance 10 Ω varies with time as Φ = (3t² + 2t + 1) Wb. What is the magnitude of induced current at t = 2 s?
- 1.0 A
- 1.7 A
- 1.4 A
- 0.8 A
Q3 · medium · AI-verified
A coil of 200 turns is placed in a magnetic field. If the magnetic flux through the coil changes from 0.04 Wb to 0.01 Wb in 0.5 seconds, what is the induced EMF?
- 6 V
- 24 V
- 3 V
- 12 V
Q4 · medium · AI-verified
In an AC circuit, the RMS voltage is 220 V. What is the peak (maximum) voltage?
- 156 V (approx.)
- 440 V
- 220 V
- 311 V (approx.)
Q5 · hard · AI-verified
In a series LCR circuit, L = 2 H, C = 32 μF, and R = 10 Ω. The circuit is connected to a 200 V AC supply. At resonance, the voltage across the inductor is:
- 5000 V
- 1000 V
- 2500 V
- 200 V