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The relative permeability (mu(r)) of a f...

The relative permeability `(mu_(r))` of a ferromagnetic substance varies with tamperature `(T)` according to the curve

A

`A`

B

`B`

C

`C`

D

`D`

Text Solution

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The correct Answer is:
C
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The ahsolute magnetic permeability mu of a specimen of magnetic material is related to magnetic intensity H according to the relation as mu=(0.6)/(H)+8.0 xx 10^(-4) T A m^(-1) . Find the value of H (in Am^(-1) ) for which magnetic induction of 0.22 T can be produced.

The specific heat of a substance varies with temperature according to c =0.2 +0.16 T + 0.024 T^(2) with T in "^(@)c and c is cal//gk . Find the energy (in cal) required to raise the temp of 2g substance from 0^(@)to 5^(@)C

Knowledge Check

  • Magnetic permeability of ferromagnetic substance is

    A
    always zero
    B
    minimum
    C
    maximum
    D
    less than paramagnetic substance and more than diamagnetic substance.

  • The relative permeability (mu_(r)) of a substance is related to its susceptibility (chi) as

    A
    `mu_(r)=I-chi`
    B
    `mu_(r)=I+chi`
    C
    `mu_(r)=I-chi^(2)`
    D
    `mu_(r)=I+chi^(2)`

  • The relative magnetic permeability of ferromagnetic materials is of the order of

    A
    10
    B
    100
    C
    1000
    D
    10000

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    The specific heat of a substance varies with temperature according to the function c = 0.20 + 0.14 T + 0.023T^(@) , with T in ""^(@)C and c in Cal//g.K , Find the energy required to raise the temperature of 1.0g of this substance from 5.0 ""^(@)C to 15""^(@)C .

    What is the value of relative magnetic permeability of perfectly diamagnetic substance ?

    The optical properties of a medium are governed by the relative permittivity (epsi_(r)) and relative permeability (mu_(r)) . The refractive index is defined as sqrt(mu_(r)epsi_(r))=n . For ordinary material, epsi_(r) gt 0 and mu_(r) gt 0 and the positive sign is taken for the squre root. In 1964, a Russian scientist V. Veselago postualted the existance of material with epsi_(r) lt 0 and mu_(r) lt 0 . Since, then such metamaterial have been produced in the laboratories and their optical properties studied. For such materials n= - sqrt(mu_(r) epsi_(r)) . As light enters a medium of such refractive index the phases travel away from the direction of propagation. (i) According to the description above show that if rays of light enter such a medium from air ( refractive index =1) at an angle theta in 2nd quadrant, then the refracted beam is in the 3rd quadrant. (ii) Prove that Snell's law holds for such a medium.

    The relative permeability of a ferromagnetic material is 500 what is its magnetic susceptibility

    In Fig. X represents time and Y represent activity of a radioactive sample. Then the activity of sample, varies with time according to the curve

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