A diamagnetic object is hung by a thread from a very sensitive spring balance between the poles of an electromagnet. When the magnetic field of the electromagnet is increased in magnitude, the reading of the spring balance will
Important Questions on Magnetic Effect of Current and Magnetism
Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure below) protruding through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate-
Magnetic materials used for making permanent magnets and magnets in a transformer have different properties of the following, which property best matches for the type of magnet required?
A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field . Then the field inside the paramagnetic substance is:
The figure gives experimentally measured vs. variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are:
These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:
