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प्रश्न
Which of the following substances are para-magnetic?
Bi, Al, Cu, Ca, Pb, Ni
उत्तर
Paramagnetic substances are Aluminum (Al) and Calcium (Ca).
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संबंधित प्रश्न
An iron rod of the area of cross-section 0.1m2 is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10-7 S. I. unit]
The susceptibility of a magnetic material is 0·9853. Identify the type of magnetic material. Draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field.
What happens to a ferromagnetic material when its temperature increases above curie temperature?
Answer in brief.
Discuss the Curie law for paramagnetic material.
Above the curie temperature the susceptibility of ferromagnetic substance varies ____________.
Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?
The given figure represents a material which is ______.
The universal property of all substances is ______.
A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of µr = 1000. The core is heated beyond the Curie temperature, Tc.
- The H field in the solenoid is (nearly) unchanged but the B field decreases drastically.
- The H and B fields in the solenoid are nearly unchanged.
- The magnetisation in the core reverses direction.
- The magnetisation in the core diminishes by a factor of about 108.
Explain the meaning of the following statement:
Curie temperature for soft iron is 770°C.
