20 multiple choice questions to test your understanding.
See answers immediately after selecting
Q1. Magnetic field around straight current-carrying wire is:
Q2. Magnetic field strength around wire is given by:
Q3. Right-hand rule for magnetic field: Thumb points in direction of:
Q4. Magnetic field inside solenoid is:
Q5. Magnetic field in solenoid B = μ₀nI depends on:
Q6. Electromagnet differs from permanent magnet in being:
Q7. Force on current-carrying conductor in magnetic field is:
Q8. Fleming's left-hand rule is used for:
Q9. In DC motor, split-ring commutator function is to:
Q10. DC motor cannot work without commutator because:
Q11. Faraday's law of electromagnetic induction states:
Q12. Lenz's law states that induced current direction always:
Q13. AC generator produces voltage that is:
Q14. Transformer voltage relationship Vs/Vp = Ns/Np is for:
Q15. Step-up transformer increases voltage, so current must:
Q16. Transformer can work with DC current:
Q17. In an ideal transformer, power input equals power output because:
Q18. Magnetic field strength increases with distance from current-carrying wire:
Q19. Number of pole pieces in DC motor are:
Q20. Rate of flux change (dΦ/dt) is maximum when coil is: