JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The angle of dip if dip needle oscillating in vertical plane makes 40 oscillations per minute in a magnetic meridian and 30 oscillations per minute in vertical plane at right angle to the magnetic meridian is

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Correct option: A

\theta=\sin ^{-1}(0.5625)

Option A (

\theta=\sin ^{-1}(0.5625)

) is correct because it uses the relationship between the oscillation frequencies in the magnetic meridian and the vertical plane to determine the angle of dip.

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

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\mu_{\mathrm{f}}

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