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  4. A bar magnet of magnetic moment 5.0 Am 2 has poles 20 cm apart. The pole strength (in Am ) is

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Q. A bar magnet of magnetic moment $5.0\, Am ^{2}$ has poles $20 \,cm$ apart. The pole strength (in $Am$ ) is ___

Magnetism and Matter

Solution:

The magnetic moment $M=5.0\, Am ^{2}$
The separation between its poles
$2 l=20\, cm =20 \times 10^{-2}\, m$
Pole strength, $m=\frac{M}{2 l}=\frac{5.0 Am ^{2}}{20 \times 10^{-2} m }=25 \,Am$