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Which of the following pairs is that of paramagnetic materials ?
Which of the following substances has relative magnetic permeability μr >> 1 ?
A diamagnetic substance is brought near the north or south pole of a bar magnet. It will be :
Assertion (A) : When a bar of copper is placed in an external magnetic field, the field lines get concentrated inside the bar. Reason (R) : Copper is a paramagnetic substance.
Assertion (A): Diamagnetic substances exhibit magnetism. Reason (R): Diamagnetic materials do not have permanent magnetic dipole moment.
Write the principle and explain the working of a moving coil galvanometer. A galvanometer as such cannot be used to measure the current in a circuit. Why ?
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