Ten questions. The result tells you which lessons you may skip.
A proton moves at \(2\times10^6\,\text{m/s}\) at right angles to a field of \(0.5\,\text{T}\). Take \(e = 1.6\times10^{-19}\,\text{C}\). The magnetic force on it is
An electron moves to the right in a field pointing into the page. The magnetic force on it points
A charged particle moves through a region containing only a magnetic field. Which quantity stays constant?
A proton moves at \(10^6\,\text{m/s}\) at right angles to a field of \(0.1\,\text{T}\). Take \(m_p = 1.67\times10^{-27}\,\text{kg}\). The radius of its circle is about
The speed of a charge circling in a uniform field is doubled. Its period
A proton and an alpha particle have the same kinetic energy and move at right angles to the same field. The ratio of their radii, proton to alpha, is
A proton at \(2\times10^6\,\text{m/s}\) enters a field of \(0.1\,\text{T}\) at \(60°\) to it; its period there is \(6.56\times10^{-7}\,\text{s}\). The pitch of its helix is about
A velocity selector has \(E = 10^5\,\text{V/m}\) and \(B = 0.2\,\text{T}\). The speed it passes undeflected is
The gap voltage of a cyclotron is doubled and nothing else is changed. The energy of the beam that leaves it
A strip carries a current to the right in a field into the page. If the carriers are negative, the top face becomes negative. If the carriers were positive, the top face would become