Consider a current-carrying loop with current , radius , and center .

A particle with charge flies through the center and into the page with velocity . What is the total electromagnetic force on the particle at the instant that it flies through the loop, in terms of the variables given?

Which of the following best describes the net magnetic flux through a closed sphere, in the presence of a magnet?

A particle of charge and mass moves with a speed of perpendicular to a uniform magnetic field, . What is the period of the particle's orbit in the field?

A proton traveling enters a uniform magnetic field and experiences a magnetic force, causing it to travel in a circular path. Taking the magnetic field to be , what is the radius of this circular path (shown in red)?

Consider two long, straight, current-carrying wires at distance from each other, each with a current of magnitude going in opposite directions.

If the two wires described are not held in place, what motion will result from the magnetic fields produced?