JEE PHYSICS MCQ: MAGNETISM AND MATTER

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The effect due to uniform magnetic field on a freely suspended magnetic needle is as follows

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Correct option: B

Torque is present but no net force

Option B (Torque is present but no net force) is correct because in a uniform magnetic field, the forces on the north and south poles are equal and opposite, resulting in a torque but no net force.

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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}}

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\mu_{\mathrm{f}}

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