JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

A vertical wire in which current is flowing produces a neutral point with the earth's horizontal field at a distance of

5 \mathrm{~cm}

from the wire in air. What is current, if

B_H=0.18 \times 10^{-4} \mathrm{~T}

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Correct option: A

4.5 A

Option A (4.5 A) is correct because it is the current calculated using the formula relating magnetic field due to a straight wire and the Earth's horizontal magnetic field.

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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