Magnetic Fields Practice Test

The passage presented a straight wire of length $L$ carrying conventional current $I$ through a uniform magnetic field $\vec{B}$, with $\vec{B}$ measured in Tesla (T) and defined by $1,\text{T}=1,\text{N}/(\text{A}\cdot\text{m})$. The magnetic force on the wire segment followed $\vec{F}=I,\vec{L}\times\vec{B}$, so the force direction was perpendicular to both the current direction and the field direction. The right-hand rule used fingers along $\vec{L}$ and curl toward $\vec{B}$, with the thumb giving $\vec{F}$, and reversing current reversed the force. This interaction explained torque production in electric motors and the behavior of current-carrying coils in MRI gradient systems. Based on the passage, how does a magnetic field affect a current-carrying wire?

The passage described magnetic fields $\vec{B}$ in technology and defined Tesla (T) as $1,\text{T}=1,\text{N}/(\text{A}\cdot\text{m})$, linking fields to forces on currents and moving charges. In an MRI system, strong superconducting magnets created a large, steady $\vec{B}$ field, while additional coils carried currents to produce controlled variations used for imaging signals. The right-hand rule related current directions to resulting field directions and to forces through cross products, without requiring complex derivations. The passage contrasted magnetic forces, which were perpendicular to motion, with electric effects that could change speed, and it also referenced electric motors as another current–field application. Based on the passage, which application is a direct result of magnetic fields?