The coercivity of a small magnet where the ferromagnet gets demagnetized is . The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetized when inside the solenoid, is :
Important Questions on Magnetism and Matter
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?
These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:
The figure gives experimentally measured vs. variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are:
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-
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:
