NEET UG · Physics

Electromagnetic Induction and Alternating Currents

17 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 17 questions

  1. The magnetic flux linked with a stationary closed coil of resistance 5 Ω varies with time t according to the equation Φ = 6t² + 7t + 1 (where Φ is in Weber and t is in seconds). What is the magnitude…
  2. A straight conducting rod of length L is rotated at a constant angular speed ω in a plane perpendicular to a uniform magnetic field B about an axis passing through one of its ends. What is the electro…
  3. A long solenoid has n turns per unit length, length l, and cross-sectional area A. If the number of turns per unit length is doubled while keeping the length and cross-sectional area unchanged, by wha…
  4. Two long coaxial solenoids S1 and S2 of equal length l have radii r1 and r2 (with r1 < r2) and turns per unit length n1 and n2 respectively. What is their mutual inductance M per unit length in vacuum…
  5. An inductor of self-inductance L = 2.0 H carries a steady current that increases uniformly from 0 to 4.0 A. What is the magnetic energy stored in the magnetic field of the inductor when the current re…
  6. In a series LR circuit connected to a DC source of EMF E at time t = 0, what fraction of the maximum steady-state current (I₀ = E/R) is established after a time interval equal to one inductive time co…
  7. An alternating voltage source is described by the equation V(t) = 220√2 sin(100πt) V. What are the root-mean-square (RMS) voltage and the frequency of this AC supply?
  8. In an AC circuit containing an ideal inductor of inductance L connected to an AC source V = V₀ sin(ωt), what is the phase relationship between the current and the applied voltage?
  9. A capacitor of capacitance C is connected across an AC voltage source of frequency f. If the frequency of the AC source is doubled while keeping the RMS voltage constant, how does the capacitive react…
  10. In a series LCR circuit, R = 30 Ω, X_L = 80 Ω, and X_C = 40 Ω. What is the total impedance Z of the circuit and the phase angle φ between the voltage and the current?
  11. What condition characterizes electrical resonance in a series LCR circuit connected to an AC voltage source of variable angular frequency ω?
  12. The Quality factor (Q-factor) of a series LCR resonant circuit measures the sharpness of its resonance. Which mathematical expression correctly gives the Q-factor in terms of R, L, and C?
  13. In an AC circuit, the instantaneous voltage is V = 100 sin(ωt) V and the instantaneous current is I = 100 sin(ωt + π/3) mA. What is the average power dissipated in the circuit over a complete cycle?
  14. What is meant by 'wattless current' in an AC circuit, and under what condition does it occur?
  15. An ideal step-down transformer is connected to a 2200 V primary line and delivers power to a 220 V load. If the primary winding has 4000 turns and the output power delivered to the load is 4.4 kW, wha…
  16. Why is the core of an electric transformer laminated with thin sheets insulated from each other by varnish rather than being made of a single solid block of iron?
  17. An LC resonant circuit contains an inductor of L = 20 mH and a fully charged capacitor of C = 50 μF. Neglecting all resistance, what is the natural angular frequency of electromagnetic oscillations in…

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