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List of top Physics Questions on Magnetism and matter

A coil of 100 turns, carrying a current of \( 5 \, \text{A} \), is placed in a magnetic field of \( 2 \, \text{T} \). The area of each turn is \( 0.01 \, \text{m}^2 \). What is the magnetic moment of the coil?
A 0.5 m long solenoid has 400 turns and carries a current of \( 3 \, \text{A} \). What is the magnetic field at the center of the solenoid?
A charged particle moves in a magnetic field with velocity $ v $ perpendicular to the field $ B $. The radius of the circular path is $ r $. Which of the following expressions gives the charge $ q $ of the particle?
The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, \(1.0 \times 10^{-2} \, \text{A} \, \text{m}^2\) and \(\frac{10^{-6}}{\pi^2} \, \text{kg} \, \text{m}^2\). If it completes 10 oscillations in 10 s, the magnitude of the magnetic field is:
Problem Figure
The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and ε is a small positive number) is:
The magnetic potential energy, when a magnetic bar of magnetic moment \( \vec{m} \) is placed perpendicular to the magnetic field \( \vec{B} \), is:
Which of the following is ferromagnetic: