A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be
[Hint. Torque = 2BIlNr N-m]

The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields

The initial permeability of an iron rod is

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