Question
Why is it not possible to make permanent magnets from paramagnetic materials?

Answer

Permanent magnets are made from the material that are easily magnetized and retain the magnetization even reverse magnetizing field is applied (high coercivity). Paramagnetic materials get small magnetization, if they are placed in magnetic field, they lose their magnetization easily if the reverse field is applied. Hence, they are not used to make permanent magnet.

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

Similar questions

The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength $\Big(\frac{1}{\lambda}\Big)$ of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength$\Big(\frac{1}{\lambda}\Big)$ of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.
  1. Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
  2. Prove that the average energy density of the oscillating electric field is equal to that of the oscillating magnetic field.
  1. In the following arrangement of capacitors, the energy stored in the 6 μF capacitor is E. Find the value of the following:
  2. Energy stored in 12 μF capacitor.
  3. Energy stored in 3 μF capacitor.
  4. Total energy drawn from the battery.

According to Newton's third law each team pulls the opposite team with equal force in a tug of war. Why then one team wins and the other loses?
When a charged comb is brought near a small piece of paper, it attracts the piece. Does the paper become charged when the comb is brought near it?
A square coil of edge l and with n turns carries a current i. It is kept on a smooth horizontal plate. A uniform magnetic field B exists parallel to an edge. The total mass of the coil is M. What should be the minimum value of B for which the coil will start tipping over?
One end of a cylindrical glass rod $(\mu=1.5)$ of radius 1.0cm is rounded in the shape of a hemisphere. The rod is immersed in water $\Big(\mu=\frac{4}{3}\Big)$ and an object is placed in the water along the axis of the rod at a distance of 8.0cm from the rounded edge. Locate the image of the object.
Find the equivalent capacitance of the network shown in the figure, when each capacitor is of $1\mu\text{F}$. When the ends X and Y are connected to a 6 V battery, find out (i) The charge and (ii) The energy stored in the network.
Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.
Find the total energy stored in the capacitors in the given network.