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Electromagnetism MCQs

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1. The unit of electric charge is:





2. Coulomb’s Law describes the force between:





3. The electric field inside a conductor is:





4. The electric potential at a point is:





5. The potential difference between two points in an electric field is the work done to move a unit:





6. Ohm’s Law states that the current through a conductor between two points is directly proportional to the:





7. The unit of resistance is:





8. A device used to store electric charge is called a:





9. The equivalent resistance of two resistors, R₁ and R₂, in series is:





10. In a parallel circuit, the voltage across each resistor is:





11. The unit of magnetic field strength is:





12. The force on a moving charge in a magnetic field is maximum when the angle between the velocity and the magnetic field is:





13. A magnetic field line forms a closed loop because:





14. The right-hand rule is used to determine the direction of:





15. The magnetic flux through a surface is maximum when the magnetic field is:





16. Faraday’s Law of Electromagnetic Induction states that the induced emf in a circuit is proportional to:





17. Lenz’s Law is a consequence of the conservation of:





18. The self-inductance of a coil depends on:





19. The unit of inductance is:





20. Mutual inductance between two coils depends on:





21. Electromagnetic waves are produced by:





22. The speed of electromagnetic waves in a vacuum is:





23. Which of the following has the longest wavelength?





24. The frequency of an electromagnetic wave is inversely proportional to its:





25. The energy of a photon is directly proportional to its:





26. The capacitance of a capacitor is defined as the ratio of:





27. The unit of capacitance is:





28. The dielectric constant of a material is always:





29. Inserting a dielectric material between the plates of a capacitor:





30. The energy stored in a capacitor is given by:





31. The direction of the electric field around a positive charge is:





32. The magnetic field around a current-carrying conductor forms:





33. The Biot-Savart law is used to calculate:





34. Gauss’s Law for electricity states that the electric flux through a closed surface is proportional to the:





35. Ampere’s Law relates the magnetic field around a closed loop to the:





36. In an AC circuit, the current and voltage are:





37. The impedance of an AC circuit containing only a resistor is:





38. The unit of impedance is:





39. In an RLC circuit, resonance occurs when the inductive reactance is:





40. The power factor of an AC circuit is the ratio of:





41. The wavelength of a microwave is:





42. The polarization of an electromagnetic wave is a property of its:





43. The time period of an alternating current (AC) is the reciprocal of its:





44. The phase difference between the voltage and current in a purely resistive AC circuit is:





45. The magnetic field inside a solenoid is:





46. The electromagnetic spectrum is arranged in increasing order of:





47. In an AC circuit with both resistive and capacitive components, the current lags the voltage by an angle that depends on:





48. A transformer operates on the principle of:





49. The efficiency of a transformer is defined as the ratio of:





50. The magnetic field at the center of a current-carrying loop is:





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