NEET UG · Physics

Moving Charges and Magnetism, Magnetic Properties of Matter

20 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 20 questions

  1. A charged particle of mass m and charge q enters a uniform magnetic field B with velocity v perpendicular to the field lines (θ = 90°). What is the kinetic energy of the particle after it completes fi…
  2. An electron and a proton having identical kinetic energies enter perpendicularly into a uniform magnetic field. How does the radius of the circular path of the proton (rp) compare to that of the elect…
  3. Why cannot a classical cyclotron be utilized to accelerate electrons to relativistic speeds?
  4. What is the magnetic field magnitude (B) at the center of a flat, circular wire coil of N turns and radius R carrying a steady current I?
  5. Two long, straight, parallel conducting wires separated by a distance d carry steady electric currents I1 and I2 in the SAME direction. What is the nature and magnitude of the magnetic force per unit…
  6. What is the magnetic dipole moment (M) of an electron revolving with speed v in a circular Bohr orbit of radius r around a hydrogen nucleus (e = elementary charge)?
  7. What is the value of the Bohr Magneton (μB), the elementary quantum unit of atomic magnetic dipole moment?
  8. Why are the pole pieces of the permanent magnet in a moving-coil galvanometer made cylindrical (concave) and equipped with a soft iron cylinder core?
  9. What is the physical meaning of Gauss's Law for Magnetism, expressed mathematically as the surface integral of magnetic flux over any closed surface: ∮ B · dA = 0?
  10. At what geographical locations on the Earth's surface does the angle of magnetic dip (inclination, δ) equal exactly 0° and 90°, respectively?
  11. Which magnetic property distinguishes diamagnetic materials from paramagnetic and ferromagnetic materials?
  12. What happens to a ferromagnetic material (such as iron or nickel) when it is heated above its characteristic Curie temperature (Tc)?
  13. Why is soft iron preferred over steel for making the cores of electromagnets and transformers?
  14. What phenomenon occurs when a material transitions into a superconducting state at critical temperature Tc, where all internal magnetic flux is completely expelled (B = 0 inside)?
  15. An electron moving with velocity v = 2.0 * 10^6 m/s enters a region of mutually perpendicular electric field E and magnetic field B. What must be the magnitude of the magnetic field B if the electric…
  16. What is the magnetic field (B) inside a long, tightly wound ideal solenoid having n turns per unit length carrying a steady electric current I?
  17. A toroid of mean radius r = 20 cm has 500 turns of wire carrying a current of 2.0 A. What is the magnetic field inside the core of the toroid?
  18. What is the gyromagnetic ratio (ratio of magnetic dipole moment to orbital angular momentum, μl / L) for an electron revolving in an atom?
  19. At a certain location on Earth, the horizontal component of Earth's magnetic field is BH = 0.30 Gauss, and the vertical component is BV = 0.52 Gauss. What is the approximate angle of magnetic dip (δ)…
  20. What is the magnetic force experienced by a straight wire of length L = 0.5 m carrying a current I = 4.0 A placed in a uniform magnetic field B = 0.5 T oriented parallel to the direction of current fl…

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