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Magnetic Moments in Materials

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Questions and Answers

What is the primary reason for the magnetic properties of materials?

Alignment of electron spins

Circulation of electrons around the nucleus

Electron density variation

Net effect of dipoles (correct)

What is the unit used to measure the magnetic moment of electrons?

Ampere

Weber

Bohr magneton (correct)

Tesla

What happens to the electrons in certain magnetic materials?

Their magnetic moments cancel each other out

Their magnetic moments of a large proportion of the electrons align (correct)

Their orbital axes align

Their spin axes align

What is the direction of the force experienced by a magnet in an external field?

Along the field Signup and view all the answers

What is the purpose of the solenoid in the experiment?

To magnetize the ferromagnetic rod Signup and view all the answers

What is the classification of magnetic materials based on?

Their magnetic susceptibility Signup and view all the answers

What is the term for the amount of force required to remove a material's retentivity?

Coercive force Signup and view all the answers

What is the characteristic of soft magnetic materials that makes them suitable for making electromagnets?

Low energy required to magnetize and demagnetize Signup and view all the answers

What happens to the value of magnetism when the magnetic field is increased until it reaches point A?

It remains constant Signup and view all the answers

What happens to the susceptibility of antiferromagnetic materials beyond the Neel temperature?

It decreases with temperature Signup and view all the answers

What is a characteristic of ferrimagnetic materials?

Antiparallel spin alignment with different magnitude Signup and view all the answers

What is the process of continuously monitoring the magnetic flux released by a ferromagnetic substance as the external magnetizing field is altered?

Hysteresis loop Signup and view all the answers

What is the result of inserting a ferromagnetic substance in a current-carrying coil?

It becomes magnetized Signup and view all the answers

What is the advantage of soft magnetic materials in terms of energy loss?

Low hysteresis loss Signup and view all the answers

What is the term for the energy loss in electric machines' ferromagnetic cores due to hysteresis?

Hysteresis loss Signup and view all the answers

What is the characteristic of the hysteresis loop of soft magnetic materials?

Small and narrow Signup and view all the answers

What is the point at which the magnetic field value diminishes, and the substance or material retains some magnetic retentivity?

Point where B and H are both zero Signup and view all the answers

What is the effect of an external field on ferrimagnetic materials?

It produces a large magnetization Signup and view all the answers