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What is a radial magnetic field? How has...

What is a radial magnetic field? How has it been achieved in moving coil galvanometer?

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(i) The pole pieces of the permanet magnet are made cylindrically concave, concentric with the axis of the coil.
(ii) A soft iron cylinder is centred between the pole pieces so that is forms a narrow cylinderical gap in which the side of the coil can move.
Together, they produce a radial magnetic field, that is, the magnetic lines of force in the gap are along radii to the central axis.
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