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Why are the pole pieces of a horseshoe m...

Why are the pole pieces of a horseshoe magnet in a moving coil galvanometer made cylinddrical in shape?

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The pole piece of a horseshoe magnet in a moving coil galvanometer are made cylindrical in shape to create a uniform radial magnetic field such that in every position, the plane of the coil remains parallel to the lines of force, i.e., in every position, `theta= 90^(@)`
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