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(I) The ability of the materials to reta...

(I) The ability of the materials to retain the magnetism in them even magnetising field vanishes is called remanence or retentivity
(II) Hysterisis means 'lagging beyond' which one is incorrect statement ?

A

I only

B

II only

C

both are correct

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
b
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Answer the following questions a. Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet. b. The hysteresis loop of soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation , which piece will dissipate greater heat energy ? c. 'A system displaying a hysteresis loop such as a ferromagnet , is a device for storing memory ? ' Explain the meaning of this statement. d. What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player , or for building ' memory stores ' in a modern computer ? e. A certain region of space is to be shielded from magnetic fields . Suggest a method.

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Knowledge Check

  • (I) Tendency of an object ot change its shape area and volume is called thermal expansion (ii) All natural process are reversible which one is incorrect statement ?

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    B
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    Two materials X and Y are magnetised, whose intensity of magnetisation are 500 A m^(-1) and 2000 A m^(-1) , respectively. If the magnetising field is 1000 A m^(-1) , then which one among these materials can be easily magnetized?.

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