IB Physics D.4 Induction Questionbank

A coil of wire with $N = 150$ turns is placed in a region where the magnetic flux through the coil changes uniformly from $2.0 \times 10^{-4}\ \text{Wb}$ to $0$ in $0.10\ \text{s}$.

A magnet is dropped through a copper ring. Which of the following correctly describes the forces acting on the magnet during its descent?

What is the SI unit of induced emf?

A square loop of side $0.10\ \mathrm{m}$ is pulled horizontally at $2.0\ \mathrm{m\ s}^{-1}$ through a region of magnetic field directed into the page. The loop enters and exits the field region entirely. What is the magnitude of the induced emf while the loop is halfway in the field region (i.e. half inside, half outside)?

A square loop of wire is pulled sideways at constant speed through a region of uniform magnetic field directed into the page. The loop then exits the field. Which best describes the net charge displaced around the loop during the motion?