JEE PHYSICS MCQ: MAGNETISM AND MATTER

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A short bar magnet is placed in a horizontal plane with its axis in the magnetic meridian. Null points are found on its equatorial line (i.e., its normal bisector) at

12.5 \mathrm{~cm}

from the centre of the magnet. The earth's magnetic field at the place is

0.38\,\mathrm{G}

and the angle of dip is zero. Locate the null points when the magnet is turned around by

180^{\circ}

. Assume that the length of the magnet is negligible as compared to the distance of the null-points from the centre of the magnet.

View answer and explanation

Correct option: A

15.75 cm

Option D (

{54^ \circ }

) is correct because it is the equivalent temperature increase on the Fahrenheit scale, calculated using the conversion formula.

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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

is slightly less than unity and that of substance

Y

is slightly more than unity, then A bar magnet is equivalent to If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

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

and

\mu_{\mathrm{f}}

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