Why is Bar Magnet Length Referred to as "2l"?

[logearav]

folks,
in higher secondary books i came across magnet's length that is bar magnet's length is given as " 2l" that is 2 multiplied by l. my question is " why the length is not referred as 'l' the usual way of referring length.
please clarify in layman terms.
thanks in advance
logesh aravindan

 

[arkhammedos]

i am a poor one in english but iff i understund : they make that in order to have a simple formula ;because(may be) they will divid by 2 so in the place to have this ugly (l/2) they just have this beautiful (l). and i recall that in the baccalaureat exam of this year ,they gave us (2l) in order to pertutbate you .

 

[logearav]

i don't understand please clarify lucidly

 

[CraigD]

I would have to see the book, but I'm assuming the l is referring to the length of a single pole, so the total length of the magnet is 2l. That is l of the north and l of the south combined.

CraigD, AMInstP
www.cymek.com

 

[Mentz114]

arkhammedos is right. Often the length is given as '2l' so the 2 will cancel out and leave a cleaner expression.

It is like choosing radius and not diameter so we can write $$A=\pi r^2$$ and not $$A=\frac{\pi D^2}{4}$$