The magnetic poles of a straight bar magnet are located $1\text{ cm}$ inward from each physical end. If the…
The magnetic poles of a straight bar magnet are located $1\text{ cm}$ inward from each physical end. If the total physical length of the bar magnet is $12\text{ cm}$, what is its magnetic length (distance between its two poles)?
$14\text{ cm}$
$11\text{ cm}$
$10\text{ cm}$
$6\text{ cm}$
Solution
The magnetic length is calculated by subtracting the two $1\text{ cm}$ end margins from the physical length: $12\text{ cm} - (1\text{ cm} + 1\text{ cm}) = 10\text{ cm}$.