Question

In a moving galvanometer, what is meant by a radial magnetic field?

Answer 1

- Hint: In these types of questions focus on the construction of moving galvanometer, its properties, and also the working of the galvanometer to find the reason for the presence of a radial magnetic field in a moving galvanometer.

Complete step-by-step solution -

The radial magnetic field is applied onto a moving coil galvanometer to create a steady torque on the spiral. The calculation of the nonlinear interaction between the current and the angle is applied such that the current can not be accurately determined. The angle between the coil plane and the magnetic field in all directions of the coil is held at zero with the help of the radial magnetic field.
It implies that the coil plane remains parallel to the force axes, so in any position $\theta = {90^ \circ }$.

Note: A galvanometer is a device used to measure electrical currents with a moving coil. It is a delicate electromagnetic device, which can measure low currents only on the order of a few microamperes. Galvanometers of the moving coil are classified essentially into two types: galvanometer of the suspended coil and galvanometer of the Pivot-coil or Weston. The idea of the Moving Coil Galvanometer is a current-carrying coil which witnesses magnetic torque when placed into an external magnetic field due to the influence of the magnetic torque, the angle at which the coil is deflected is proportional to the amount of the current in the coil.