MEDIUM
Earn 100
Which of the following statements about magnetic materials is NOT TRUE?
50% studentsanswered this correctly
Important Questions on Magnetic Materials
EASY
Magnetic susceptibility of a paramagnetic substance is
EASY
The magnetic susceptibility is negative for:
EASY
The magnetization of bar magnet of length , cross-sectional area and net magnetic moment is
EASY
Which one of the following characteristics is not associated with a paramagnetic material?
MEDIUM
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-
EASY
Coercivity of a magnet where the ferromagnet gets completely demagnetized is . The minimum current required to be passed in a solenoid having turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is
MEDIUM
A domain in ferromagnetic iron in the form of cube is having atoms. If the side length of this domain is and each atom has a dipole moment of , then magnetisation of domain is
MEDIUM
An iron rod of susceptibility is subjected to a magnetising field of . The permeability of the material of the rod is:
EASY
An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity , the magnetic field inside the superconductor will be such that
HARD
Nickel combines with a uninegative monodentate ligand to form a diamagnetic complex The hybridisation involved and the number of unpaired electrons present in the complex are respectively:
EASY
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?
EASY
A long solenoid has the radius and turns. It carries a current of . If it is equivalent to a magnet of the same size and magnetization then is:
EASY
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:
MEDIUM
The figure gives experimentally measured vs. variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are:
EASY
A paramagnetic sample shows a net magnetisation of when it is placed in an external magnetic field of at a temperature of . When the sample is placed in an external magnetic field of at a temperature of , then the magnetisation will be :
EASY
The meniscus of a liquid contained in one of the limbs of a narrow U -tube is placed between the poles of an electromagnet with the meniscus in a line with the field. The liquid is seen to rise to the line. This indicate that the liquid is ___ .
EASY
A paramagnetic sample shows a net magnetization of when placed in an external magnetic field of at a temperature of . When the same sample is placed in an external magnetic field of at a temperature of . The magnetization will be
MEDIUM
Hysteresis loops for two magnetic materials and are given below:
These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:
MEDIUM
The coercivity of a small magnet, where the ferromagnet gets demagnetised is . The current required to be passed in a solenoid of length and number of turns , so that the magnet gets demagnetised when inside the solenoid is
EASY
A paramagnetic material has . Its magnetic susceptibility at temperature is . Its susceptibility at is
