Magnetism Practice
10 problems · instant feedback · full explanations
Magnetic forces act on moving charges: F = qvB sinθ. Remember the right-hand rules — they encode the cross-product geometry.
Q1.
What is the SI unit of magnetic field strength?
Multiple choice · Easy
Q2.
A proton (1.6×10⁻¹⁹ C) moves at 10⁶ m/s perpendicular to a 0.5 T field. What is the magnetic force? (Answer in N, scientific notation.)
Numerical answer (N) · Medium
Q3.
A charge moves parallel to a magnetic field. The magnetic force is:
Multiple choice · Easy
Q4.
Why does a current-carrying wire feel a force in a magnetic field?
Multiple choice · Medium
Q5.
Unlike electric field lines, magnetic field lines:
Multiple choice · Easy
Q6.
An electron (9.11e-31 kg) at 2e7 m/s enters a 0.01 T field perpendicularly. What is its path radius? (cm)
Numerical answer (cm) · Hard
Q7.
A compass works because its needle aligns with Earth's magnetic field.
True / False · Easy
Q8.
Isolated magnetic monopoles have been observed in nature.
True / False · Medium
Q9.
An electron moves along +x through a field along +y. What is the force direction?
Multiple choice · Hard
Q10.
What is the magnetic force on a 2 m wire carrying 3 A perpendicular to a 0.4 T field? (N)
Numerical answer (N) · Medium