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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A magnetized wire of magnetic moment '

M

' and length '

l

' is bent in the form of a semicircle of radius '

r

'. The new magnetic moment is.

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Correct option: B

\frac{{2Mr}}{l}

Option B (

\frac{{2Mr}}{l}

) is correct because the new magnetic moment is calculated based on the geometry of the semicircle and the original magnetic moment.

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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

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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