Chapter 59 of 2364 min read

Torque on a current loop, moving-coil galvanometer

Why this is asked: Torque on a current loop is maximum when the loop's plane lies along B and zero when the plane is perpendicular to B — a galvanometer uses a radial field specifically to hold this torque near maximum through the whole swing, giving a linear scale.

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Test yourself

•A model for the quantised motion of an electron in a uniform magnetic field $B$ states that the flux passing through the orbit of the electron is $n (h / e)$ , where $n$ is an integer, $h$ is Planck's constant and $e$ is the magnitude of the electron's charge. According to the model, the magnetic moment of an electron in its lowest energy state will be ( $m$ is the mass of the electron):
•A 2 A current is flowing through two different small circular copper coils having a radii ratio of 1 : 2. The ratio of their respective magnetic moments will be:

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