- ANon-magnetic material.
- BPara magnetic material.
- CDia magnetic material.
- DAll of the above.
Explanation:
Above curie temperature ferromagnetic material behaves like paramganetic materials. There magnetic susceptibilty starts varying linearly with temperature. Their I becomes too small above curies temperature.
Therefore, nature of ferrromagnetic materials becomes paramagnetic.
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Two parallel beams of electrons moving in the same direction produce a mutual force
|
(a) Of attraction in plane of paper |
|
(b) Of repulsion in plane of paper |
|
(c) Upwards perpendicular to plane of paper |
|
(d) Downwards perpendicular to plane of paper |
Which of the following particle has similar mass to electron
|
(a) Proton |
(b) Neutron |
(c) Positron |
(d) Neutrino |
The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
|
(a) 4125 Å |
(b) 2062.5 Å |
(c) 3000 Å |
(d) 6000 Å |