Magnetism Test

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1. What is the north pole of a bar magnet?

c) The point which attracts the south pole of another magnet a) The point which attracts the north pole of another magnet b) The point which repels the north pole of another magnet d) The point at the center of the magnet

2. The magnetic dipole moment of a current loop is proportional to:

b) Current and area of the loop a) Current and length of the loop c) Voltage and area of the loop d) Voltage and length of the loop

3. A current solenoid is equivalent to a:

c) Bar magnet with north and south poles a) Magnetic monopole b) Electromagnet with no poles d) Permanent magnet only

4. The magnetic dipole moment of a bar magnet is:

a) Product of magnetic pole strength and distance between the poles b) Product of electric charge and velocity c) Product of current and voltage d) Sum of magnetic field and resistance

5. Coulomb’s Law in magnetism describes:

b) The force between two magnetic monopoles a) The force between two electric charges c) Force on a current-carrying wire in a magnetic field d) The energy stored in a magnetic field

6. Which of the following is NOT an important term in magnetism?

c) Capacitance a) Magnetic field intensity b) Magnetic flux d) Magnetic permeability

7. The magnetic field due to a magnetic dipole falls off as:

c) 1/r³ a) 1/r b) 1/r² d) 1/r⁴

8. The torque experienced by a magnetic dipole in a uniform magnetic field is maximum when the dipole moment is:

b) Perpendicular to the magnetic field a) Parallel to the magnetic field c) Anti-parallel to the magnetic field d) At 45 degrees to the magnetic field

9. Terrestrial magnetism refers to:

b) The earth’s magnetic field naturally present a) Magnetic field produced artificially on earth c) Magnetic field of a bar magnet d) Magnetic field inside a solenoid

10. The elements of the earth's magnetic field include:

a) Declination, inclination, and horizontal intensity b) Voltage, current, and resistance c) Flux, torque, and work done d) Temperature, pressure, and humidity

11. The tangent law relates:

c) Components of earth's magnetic field using a tangent formula a) Electric field and magnetic field b) Magnetic forces and electric charges d) Torque on a magnetic dipole to magnetic moment

12. Which material is diamagnetic?

b) Copper a) Iron c) Nickel d) Cobalt

13. Paramagnetic substances:

b) Are weakly attracted by magnetic fields a) Are strongly attracted by magnetic fields c) Are weakly repelled by magnetic fields d) Show permanent magnetism

14. Ferromagnetic substances:

a) Have permanent magnetic moments that can align b) Are always non-magnetic c) Are weakly repelled by magnetic fields d) Show no interaction with magnetic fields

15. Curie’s law in magnetism states that:

b) Magnetization varies directly with magnetic field and inversely with temperature a) Magnetization is independent of temperature c) Magnetic field decreases with increase in temperature d) Magnetic susceptibility is zero at any temperature

16. Hysteresis in magnetism describes:

a) The lag of magnetization behind the magnetic field changes b) Increase in magnetic field with time c) Constant magnetic field irrespective of current d) The loss of magnetic properties due to heating

17. Magnetic field lines emerge from which pole of a bar magnet?

b) North pole a) South pole c) Both poles equally d) Center of the magnet

18. The unit of magnetic dipole moment is:

c) Ampere-meter squared (A·m²) a) Weber (Wb) b) Tesla (T) d) Henry (H)

19. How many poles does a bar magnet generally have?

b) Two a) One c) Three d) Four

20. Magnetic susceptibility of diamagnetic materials is:

b) Negative and small a) Positive and large c) Zero d) Positive and small

21. What happens to a ferromagnetic material when heated beyond the Curie temperature?

b) It loses its permanent magnetic properties a) It becomes a superconductor c) It becomes an insulator d) It becomes paramagnetic permanently

22. The work done on a magnetic dipole in a magnetic field is:

a) Product of torque and angle turned b) Product of force and displacement c) Zero always d) Independent of magnetic moment

23. Magnetic field inside a long current-carrying solenoid is:

a) Uniform and parallel to axis b) Varying and perpendicular to axis c) Zero d) Circular around the axis

24. The north magnetic pole of the earth is actually the:

b) Magnetic south pole a) Geographic north pole c) Magnetic north pole d) Geographic south pole

25. Magnetic permeability is defined as:

b) The measure of the ability of a material to support the formation of a magnetic field a) The measure of resistance to magnetic field c) The unit of magnetic force d) The force between two magnets