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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The magnetic needle of an oscillation magnetometer makes 10 oscillations per min under the action of earth’s magnetic field alone. When a bar magnet is placed at some distance along the axis of the needle, it makes 14 oscillations per min. If the bar magnet is turned so that its poles interchange their positions, then the new frequency of oscillation of the needle is

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Correct option: B

2

\mathrm{vibs}

-

{\mathrm{m}^{ - 1}}

Correct Answer: 2

\mathrm{vibs}

-

{\mathrm{m}^{ - 1}}

. The frequency of oscillation is calculated by considering the magnetic field due to the bar magnet and its effect on the oscillation 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}}

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

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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