JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The two bar magnets placed together in a vibration magnetometer take 3 seconds for 1 vibration. If one magnet is reversed, the combination takes 4 seconds for 1 vibration. Find the ratio of their magnetic moments.

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Correct option: D

3.57

Option D (3.57) is correct because it is the calculated ratio of the magnetic moments using the given time periods for vibration magnetometer.

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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}}

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is slightly less than unity and that of substance

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

and

\mu_{\mathrm{f}}

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