Ten questions. The result tells you which lessons you may skip.
A flat coil of area \(0.05\,\text{m}^2\) has its normal at \(60°\) to a uniform field of \(0.4\,\text{T}\). The flux through it is
The net magnetic flux out of any closed surface is
A coil of \(100\) turns, each of area \(0.02\,\text{m}^2\), lies face-on in a field of \(0.5\,\text{T}\). The field falls to zero in \(0.25\,\text{s}\). The average emf is
A magnet is pushed into a coil once slowly and once quickly, over the same distance. The charge that flows through the coil's circuit is
A loop lies in the page in a field into the page that is growing. The induced current, seen from the front, is
Lenz's law is a consequence of
A rod \(1\,\text{m}\) long moves at \(5\,\text{m/s}\) across a field of \(0.2\,\text{T}\), all three at right angles. The emf between its ends is
A rod PQ, with P at the top, moves to the right in a field into the page. Which end is positive?
A rod \(2\,\text{m}\) long turns about one end at \(4\,\text{rad/s}\) in a field of \(0.1\,\text{T}\) at right angles to its plane. The emf between its ends is
A steady force of \(0.2\,\text{N}\) pulls a rod \(0.2\,\text{m}\) long along smooth rails closed through \(4\,\Omega\), in a field of \(1\,\text{T}\). The terminal speed is