Download App

Magnetic Materials — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMagnetic Materials3 Marks
Question
What should be retentivity and coercivity of permanent magnet?
✓

Answer

A permanent magnet should have a large zero-field magnetization and should need a very large reverse field to demagnetize. In other words, it should have a very broad hysteresis loop with high retentivity and very high coercivity.

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 "Answer the following in Brief" 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

Light of wavelength $650 \ nm$ falls on the objective of a microscope having total angle of angular separation as $60^{\circ}$. Calculate the resolving power of the microscope. $[$Refractive index of air $=1 ]$
→
What is a toroid? With a neat diagram, describe the magnetic field produced by a toroid carrying a steady current.
→
Obtain the balancing conditions in case of Wheatstone's bridge.
→
A simple harmonic progressive wave travels along a string. The time for a particle of the string to move from maximum displacement to zero is $0.004 s$. What are the period and frequency of the wave ? If the wavelength is $1.2 m$, what is the wave speed?
→
A parallel$-$plate air capacitor has rectangular plates, each of area $20 \ cm ^2$ separated by a distance of $2 \ mm$. The potential difference between the plates is $500$ volts. Calculate $(i)$ its capacitance $(ii)$ the charge on each plate $(iii)$ the electric field intensity between the two plates.
→
In a biprism experiment, a source of light having wavelength $6500 A$ is replaced by a source of light having wavelength $5500 A$. Calculate the change in the fringe width, if the screen is at a distance of $1 m$ from the sources which are $1\ mm$ apart.
→
On the basis of molecular theory explain the phenomenon of surface tension
→
State an expression for K.E. (kinetic energy) and P. E. (potential energy) at displacement 'x' for a particle performing linear S.H.M. Represent them graphically. Find the displacement at which K. E. is equal to P. E.
→
A coil has $1000$ turns, each of area $0.5 m ^2$. What is the magnetic moment of the coil when it carries a current of $1 \ mA$ ?
→
The combined resistance of a galvanometer of resistance $1000 \Omega$ and its shunt is $25 \Omega$.
Calculate the value of the shunt.
→