Download App

Magnetic Materials — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Materials2 Marks
Question
Define:
(1) retentivity
(2) coercivity.
✓

Answer

1. Retentivity : The residual magnetic flux density or magnetization in a magnetic material when the magnetizing field intensity is reduced to zero is called retentivity or remanence.
2. Coercivity: The reversed magnetizing field strength required to reduce the remanent magnetic flux density or magnetization in a magnetic material from its remanent value to zero, i.e, to demagnetize the magnetic material completely, is

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Short Answer Type Question" from Magnetic Materials→Magnetic Materials — all question types→Physics STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

How can the resolving power of a telescope be increased?
→
A satellite moves around the Earth in an elliptical orbit such that at perigee (closest approach) it is two Earth radii above the Earth's surface. At apogee (farthest position), it travels with one-fourth the speed it has at perigee. In terms of the Earth's radius R, what is the maximum distance of the satellite from the Earth's surface?
→
A voltmeter has a resistance $30\ \Omega.$ What will be its reading, when it is connected across a cell of emf $2\ V$ having internal resistance $10\ \Omega?$
→
A coil of 100 turns, each of area \(0.02 m ^2\) is kept in a uniform field of induction \(3.5 \times 10^{-5} T\). If the coil rotates with a speed of 6000 r.p.m. about an axis in the plane of the coil and perpendicular to the magnetic induction, calculate peak value of e.m.f. induced in the coil.
→
What is a quasistatic process ?
→
Explain why flow speed is greatest where streamlines are closest together.
→
Draw the block diagram of a simple rectifier circuit with the respective output waveform.
→
When two tuning forks of slightly different frequencies are sounded together to produce beats, what is the effect on beat frequency if the prongs of the tuning fork with lower frequency is waxed a little or filed a little?
→
Distinguish between a potentiometer and a voltmeter.
→
Differentiate between free and forced vibrations.
→