Ten questions. The result tells you which lessons you may skip.
A straight wire \(0.5\,\text{m}\) long carries \(4\,\text{A}\) at \(30°\) to a uniform field of \(0.2\,\text{T}\). The force on it is
A wire on the page carries a current to the right in a field into the page. The wire is pushed
A semicircular wire of radius \(0.1\,\text{m}\) carries \(5\,\text{A}\) in a uniform field of \(0.2\,\text{T}\) perpendicular to its plane. The force on it is
A closed triangular loop carrying a current lies in a uniform magnetic field. The net force on it is
Two long parallel wires \(0.1\,\text{m}\) apart carry \(10\,\text{A}\) and \(20\,\text{A}\) in the same direction. The force on each metre of either wire is
A coil of \(100\) turns, each of area \(0.02\,\text{m}^2\), carries \(0.5\,\text{A}\). Its magnetic moment is
A coil of moment \(0.5\,\text{A m}^2\) has its moment at \(90°\) to a field of \(0.4\,\text{T}\). The torque on it is
A coil of moment \(1\,\text{A m}^2\) is in a field of \(0.5\,\text{T}\). The work needed to turn it from \(\vec M\) along \(\vec B\) to \(\vec M\) against \(\vec B\) is
An electron moves round a circle anticlockwise. Its magnetic moment points
The scale of a moving-coil galvanometer is linear because