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Why are pole ...

Question

Why are pole pieces of galvanometer made concave?

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Solution

Pole pieces of galvanometer made concave:
Pole pieces of galvanometer are made concave so that the magnetic field and the current-carrying coil are always perpendicular to each other.
It produces a radial magnetic field.
The moving coil rotates in the magnetic field produced by the permanent magnet, the equal and opposite force rotates the coil.
The diagram of the galvanometer with concave pole pieces is given below:

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