JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A steel wire of length 1 has a magnetic moment

m

. It is bent into a semicircular arc. What is the new magnetic moment?

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Correct option: A

\frac{2 m}{\pi}

Option A (

\frac{2 m}{\pi}

) is correct because the new magnetic moment is calculated by dividing the original magnetic moment by the original length and multiplying by the new separation between the poles.

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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

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