Question

Find the magnetization of a bar magnet of length 5 cm and cross-sectional area 2 cm2, if the magnetic moment is 1 Am2.​

Answer 1

We have to find the magnetization of a bar magnet of length 5 cm and cross sectional area 2 cm² if the magnetic moment is 1 Am².

solution : length of the bar magnet, l = 5 cm = 0.05 m

magnet moment , m = 1 Am²

cross sectional area of magnet , A = 2 cm² = 2 × 10⁻⁴ m²

we know,

   magnetization of a bar magnet is given by , M = magnetic moment of the bar magnet/volume of the bar magnet

= m/Al

= 1/(2 × 10⁻⁴ × 0.05) = 1/(10 ×10⁻⁶) = 10⁵ A/m

therefore the magnetisation of the bar magnet is 10⁵ A/m.

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Answer 2

Magnetization of the bar magnet = 10⁵ A/m