Answer:
The magnetic field generated by the two concave poles of magnets is called radial magnetic field as shown in figure. 
If we place a soft iron cylindrical core between the concave poles, we get magnetic field lines along the radii of circular plane of the cylinder. Use of radial magnetic field in a moving coil galvanometer. The current through a galvanometer coil is \[I=\frac{k}{NAB\sin \theta }\alpha \] ?(i) Due to this, sin9 term in Eq. (i), the deflection \[\alpha \] of the galvanometer is not quite proportional to the current I. So that, the instrument is not a linear one. To make its scale linear, the field is made radial. Then, \[\theta =90{}^\circ ,\] so that \[I=\frac{k}{NBA}\alpha \] Thus, \[I\propto \alpha \]
You need to login to perform this action.
You will be redirected in
3 sec
