Question
Physics Question on Moving charges and magnetism
In moving coil galvanometer, strong horse shoe magnet of concave shaped pole pieces is used to
A
increase space for rotation of coil
B
reduce weight of galvanometer
C
produce magnetic field which is parallel to plane of coil at any position
D
make magnetic induction weak at the centre
Answer
produce magnetic field which is parallel to plane of coil at any position
Explanation
Solution
The horseshoe magnet has cylindrically concave pole-pieces. Due to its shape the magnet produces radial magnetic field, so that when the coil rotates in any position its plane is always parallel to the direction of the magnetic field. This has been shown in the figure given below.
