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Calculate the flux density due to a circular conductor of radius 100nm and current 5A in air.
a Explanation: The field intensity of this conductor is I/2πR and since B = μH, the flux density will be B = μI/2πR. Put I = 5 and R = 100 x 10-9, thus we get B = 4π x 10-7x 5/(2πx 100 x 10-9) = 10 units.
a
See lessExplanation: The field intensity of this conductor is I/2πR and since B = μH, the flux
density will be B = μI/2πR. Put I = 5 and R = 100 x 10-9, thus we get B = 4π x 10-7x 5/(2πx 100 x 10-9) = 10 units.
Find the Lorentz force due to a conductor of length 2m carrying a current of 1.5A and magnetic flux density of 12 units.
b Explanation: The Lorentz is given by the product of the current, differential length and the magnetic flux density. Put B = 12, I = 1.5 and L = 2, thus we get F = BIL = 12 x 1.5 x 2 = 36 units.
b
See lessExplanation: The Lorentz is given by the product of the current, differential length and the magnetic flux density. Put B = 12, I = 1.5 and L = 2, thus we get F = BIL = 12 x 1.5 x 2 = 36 units.
In ferromagnetic materials the susceptibility is infinity. State True/False
a Explanation: The ferromagnetic materials are iron, nickel, cobalt which are highly attracted by magnetic field. Thus their susceptibility is also very high and nearing infinity. Also ferrimagnetics have infinite susceptibility.
a
See lessExplanation: The ferromagnetic materials are iron, nickel, cobalt which are highly
attracted by magnetic field. Thus their susceptibility is also very high and nearing infinity. Also ferrimagnetics have infinite susceptibility.
The susceptibility is independent of temperature in which material?
c Explanation: In the diamagnetic materials, the susceptibility is very small and negative. Thus the susceptibility will be independent of the temperature. The atoms of solids having closed shells and metals like gold have this property.
c
See lessExplanation: In the diamagnetic materials, the susceptibility is very small and negative. Thus the susceptibility will be independent of the temperature. The atoms of solids having closed shells and metals like gold have this property.
The materials having very small susceptibility at all temperatures are
a Explanation: In antiferromagnetic materials, the susceptibility will decrease with increase in temperature. They have relatively small susceptibility at all temperatures.
a
See lessExplanation: In antiferromagnetic materials, the susceptibility will decrease with increase in temperature. They have relatively small susceptibility at all temperatures.
The converse of magnetostriction is called the
c Explanation: When a strain is applied, the change in magnetic field is observed. This is the converse of the magnetostriction phenomenon and is called Villari effect.
c
See lessExplanation: When a strain is applied, the change in magnetic field is observed. This is the converse of the magnetostriction phenomenon and is called Villari effect.
Piezoelectric effect is analogous to which phenomenon?
b Explanation: The piezoelectric effect is the mechanical strain caused on a material like quartz when subjected to an electric field. The same is observed in a ferromagnetic material called magnetostriction.
b
See lessExplanation: The piezoelectric effect is the mechanical strain caused on a material like
quartz when subjected to an electric field. The same is observed in a ferromagnetic
material called magnetostriction.
In which materials the magnetic anisotropy is followed?
c Explanation: In materials like iron, the magnetic properties depend on the direction in which they are measured. This is magnetic anisotropy. The material iron is a ferromagnetic material type.
c
See lessExplanation: In materials like iron, the magnetic properties depend on the direction in which they are measured. This is magnetic anisotropy. The material iron is a
ferromagnetic material type.
Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units.
d Explanation: From Curie law, the internal field of a magnetic material is given by H = Ho + χ M, where χ is the molecular field constant. Put χ = 0.1, M = 74 and Ho = 12, we get H = 12 + (0.1)74 = 19.4 units.
d
See lessExplanation: From Curie law, the internal field of a magnetic material is given by H = Ho + χ M, where χ is the molecular field constant. Put χ = 0.1, M = 74 and Ho = 12, we get H = 12 + (0.1)74 = 19.4 units.
The magnetic materials follow which law?
d Explanation: Generally, the ferromagnetic, paramagnetic and diamagnetic materials follow the Curie Weiss law, which relates the magnetization and the applied field.
d
See lessExplanation: Generally, the ferromagnetic, paramagnetic and diamagnetic materials
follow the Curie Weiss law, which relates the magnetization and the applied field.