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Why does a paramagnetic sample display g...

Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled?

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This a becauses at lower temperature, the tendency to disrupt the alignment of dipoles (due to magnetising field) decreases on account of reduced random thermal motion.
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Knowledge Check

  • If M is the magnetic moment, mu is the magnetic permeability and H is the intensity of magnetising field, then the dimensional formula for mu MH is

    A
    `ML^(2)T^(-2)`
    B
    `ML^(2)T^(-2)I^(2)`
    C
    `ML^(2)T^(-3)`
    D
    `ML T^(-2)I`

  • (A): The induced e.m.f. and current will be same in two identical loops of copper and aluminium, when rotated with same speed in the same magnetic field. (R) : Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire

    A
    Both .A. and .R. are true and .R. is the correct explanation of .A.
    B
    Both .A. and .R. are true and .R. is not the correct explanation of .A.
    C
    .A. is true and .R. is false
    D
    .A. is false and .R. is true

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