JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction
Reason: Dip needle will stay vertical at the north pole of earth.

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Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

Option B is correct because both the assertion and the reason are true, but the reason does not directly explain the assertion. The compass needle's behavior is due to the zero horizontal magnetic field, while the dip needle's vertical orientation is due to the 90-degree dip angle.

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

and

\mu_{\mathrm{f}}

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