Practice & Test Moving Charges and Magnetism

A straight wire of length $L$ carrying a current $I$ is placed in a uniform magnetic field $B$. The wire makes an angle $\theta$ with the magnetic field. The magnitude of the magnetic force on the wire is:

A circular current loop of radius $R$ carrying current $I$ is placed in a uniform magnetic field $\vec{B}$. The plane of the loop is perpendicular to $\vec{B}$. The current flows in a clockwise direction as viewed from above the loop. Describe the force and torque experienced by the loop. (Assume the magnetic field points upwards, perpendicular to the loop's plane). The diagram shows a circular loop of wire with current $I$ flowing clockwise. A uniform magnetic field $\vec{B}$ is directed upwards, normal to the plane of the loop.

A charged particle moves through a magnetic field perpendicular to its direction. Which of the following quantities of the particle changes?