JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

Assume that each iron atom has a permanent magnetic moment equal to

2\, \mathrm{Bohr}

magnetons (1 Bohr magneton equals

9.27 \times 10^{-24} \mathrm{~A} \mathrm{~m}^2

). The density of atoms in iron is

8.52 \times 10^{28}

atoms

\mathrm{m}^{-3}

. (a) Find the maximum magnetization

I

in a long cylinder of iron. (b) Find the maximum magnetic field

B

on the axis inside the cylinder.

View answer and explanation

Correct option: C

1.58 \times 10^6 \mathrm{~A};\,\,2.0 \mathrm{~T}

Option C (

1.58 \times 10^6 \mathrm{~A};\,\,2.0 \mathrm{~T}

) is correct because it is calculated using the given Bohr magneton value and the density of atoms in iron.

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