1. What is the SI unit of magnetic flux density?
A) Tesla
B) Ohm
C) Henry
D) Volt
Answer: A
2. Which law describes the force between two electric charges?
A) Ampère’s Law
B) Coulomb’s Law
C) Faraday’s Law
D) Ohm’s Law
Answer: B
3. What is the value of the permittivity of free space (ε₀)?
A) 8.85 × 10⁻¹² F/m
B) 1.6 × 10⁻¹⁹ C
C) 9.8 m/s²
D) 3 × 10⁸ m/s
Answer: A
4. Which of the following statements about electric potential is true?
A) It is a vector quantity.
B) It is a scalar quantity.
C) It depends on the amount of charge only.
D) It is not related to electric fields.
Answer: B
5. What is the direction of the magnetic field around a straight current-carrying conductor?
A) Radial outward
B) Tangential to the conductor
C) Axial to the conductor
D) Spherical
Answer: C
6. Which law states that the induced electromotive force (emf) in any closed circuit is equal to the negative rate of change of magnetic flux through the circuit?
A) Ampère’s Law
B) Faraday’s Law of Electromagnetic Induction
C) Lenz’s Law
D) Gauss’s Law for Electricity
Answer: B
7. The SI unit of magnetic flux is:
A) Weber
B) Henry
C) Tesla
D) Ohm
Answer: A
8. What happens to the resistance of a conductor when its temperature increases?
A) Increases
B) Decreases
C) Remains the same
D) Depends on the material
Answer: A
9. What is the direction of the force experienced by a charged particle moving in a magnetic field?
A) Parallel to the magnetic field
B) Opposite to the direction of motion
C) Perpendicular to both the magnetic field and the direction of motion
D) Along the direction of motion
Answer: C
10. What is the SI unit of electric current?
A) Ampere
B) Volt
C) Ohm
D) Weber
Answer: A
11. In which direction does the induced current flow in a conductor when it is moved across a magnetic field according to Lenz’s Law?
A) In the same direction as the motion
B) In the opposite direction to the motion
C) Random direction
D) Parallel to the magnetic field
Answer: B
12. Which of the following materials is ferromagnetic?
A) Copper
B) Aluminum
C) Iron
D) Silver
Answer: C
13. The electromagnetic spectrum includes which of the following types of radiation?
A) Visible light
B) X-rays
C) Radio waves
D) All of the above
Answer: D
14. What type of electromagnetic waves are used in MRI scanners?
A) X-rays
B) Microwaves
C) Radio waves
D) Gamma rays
Answer: C
15. Which law relates the electric field in a closed surface to the net charge enclosed by that surface?
A) Ampère’s Law
B) Gauss’s Law for Electricity
C) Faraday’s Law of Electromagnetic Induction
D) Lenz’s Law
Answer: B
16. What is the force experienced by a current-carrying conductor in a magnetic field according to Lorentz force law?
A) F = qE
B) F = ILBsinθ
C) F = ma
D) F = kq₁q₂/r²
Answer: B
17. Which of the following phenomena is used in the operation of an electric generator?
A) Electromagnetic induction
B) Ohm’s Law
C) Newton’s Law
D) Coulomb’s Law
Answer: A
18. What is the direction of the induced current in a closed loop when the magnetic flux through the loop decreases?
A) Clockwise
B) Counterclockwise
C) No current is induced
D) Depends on the material of the loop
Answer: A
19. Which of the following quantities is conserved in a circuit according to Kirchhoff’s laws?
A) Charge
B) Energy
C) Momentum
D) All of the above
Answer: D
20. Which of these is a unit of magnetic pole strength?
A) Coulomb
B) Ampere
C) Weber
D) Tesla
Answer: B
21. What is the formula for the magnetic field due to a long straight conductor?
A) B = (μ₀I) / (2πr)
B) B = (μ₀I) / (4πr)
C) B = (2πr) / (μ₀I)
D) B = (4πr) / (μ₀I)
Answer: A
22. Which law describes the magnetic field produced by a current-carrying conductor?
A) Ampère’s Law
B) Faraday’s Law
C) Lenz’s Law
D) Coulomb’s Law
Answer: A
23. What happens to the capacitance of a parallel plate capacitor when the distance between the plates is increased?
A) Increases
B) Decreases
C) Remains the same
D) Depends on the charge
Answer: B
24. Which of these quantities is not a vector?
A) Electric field intensity
B) Electric potential
C) Magnetic flux
D) Magnetic field intensity
Answer: B
25. Which device is used to measure electric current?
A) Voltmeter
B) Ammeter
C) Ohmmeter
D) Galvanometer
Answer: B
26. What does the right-hand rule for magnetic fields determine?
A) Direction of electric current
B) Direction of magnetic field around a current-carrying conductor
C) Direction of electric field lines
D) Direction of electric potential
Answer: B
27. Which of the following statements about magnetic materials is true?
A) Diamagnetic materials repel external magnetic fields.
B) Ferromagnetic materials have very low permeability.
C) Paramagnetic materials are strongly magnetized in the absence of an external magnetic field.
D) Ferromagnetic materials can be easily magnetized and retain their magnetization.
Answer: D
28. What is the direction of the electric field lines produced by a positive point charge?
A) Radially inward
B) Radially outward
C) Tangential to the charge
D) Perpendicular to the charge
Answer: B
29. Which law states that the electromotive force (emf) induced in a circuit is proportional to the rate of change of current in the circuit?
A) Ampère’s Law
B) Faraday’s Law
C) Lenz’s Law
D) Ohm’s Law
Answer: B
30. Which of the following is a property of superconductors?
A) Zero resistance to electric current
B) High resistance to electric current
C) Low permeability to magnetic fields
D) High capacitance
Answer: A
31. What type of material is used as a core in transformers to enhance magnetic induction?
A) Copper
B) Silver
C) Iron
D) Aluminum
Answer: C
32. Which of the following units is used to measure magnetic flux?
A) Tesla
B) Weber
C) Ohm
D) Henry
Answer: B
33. Which law states that the total current entering a junction must equal the total current leaving the junction in an electrical circuit?
A) Coulomb’s Law
B) Ampère’s Law
C) Faraday’s Law
D) Kirchhoff’s Current Law
Answer: D
34. What is the direction of the Lorentz force on a charged particle moving perpendicular to both the electric and magnetic fields?
A) Along the direction of motion
B) Opposite to the direction of motion
C) Perpendicular to both fields
D) No force is exerted
Answer: C
35. Which of the following quantities is associated with the inductance of a coil?
A) Voltage
B) Current
C) Magnetic flux
D) Resistance
Answer: C
36. Which law states that the force per unit length between two parallel current-carrying conductors is directly proportional to the current and inversely proportional to the distance between them?
A) Coulomb’s Law
B) Ohm’s Law
C) Ampère’s Law
D) Lenz’s Law
Answer: C
37. What is the direction of the magnetic field inside a solenoid carrying current?
A) Along the axis of the solenoid
B) Tangential to the solenoid
C) Radial outward from the solenoid
D) Depends on the current direction
Answer: A