Answer: mB sinθ.
- A mB sinθ
- B mB cosθ
- C always mB
- D m divided by B
Correct answer: A. mB sinθ
Explanation: τ = m × B = mB sinθ, where θ is the angle between the dipole and the field.
Magnetic field of a bar magnet: field lines emerge from the north pole and re-enter at the south pole outside the magnet, forming continuous closed loops. Image: Geek3, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Bar magnets, Earth's magnetism, and how different materials respond to an external magnetic field - diamagnetic, paramagnetic, and ferromagnetic behaviour.