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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Which of the following is represented by the area enclosed by a hysteresis loop (

B - H

curve)?

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Correct option: C

Heat energy lost per unit volume in the sample

Option C is correct because the area of the hysteresis loop represents the energy lost as heat per unit volume during each magnetization cycle.

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Curie temperature is the one above which A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is The relative permeability of a substance

X

is slightly less than unity and that of substance

Y

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\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

\mu_{\mathrm{f}}

respectively, then :- Which of the following is most suitable for the core of electromagnets