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We have been studying electromagnetic induction in Physics and when calculating Flux Linkage our teacher insisted the unit is Weber-Turns since it is the flux times the number of turns. I put forward that the turns is a unitless measure since it is just a quantity. It would be like saying, one apple weighs 100g so 10 apples must weight 1 kilogram-apples. That sounds ridiculous.

She agreed with my logic but says the exam board use Weber-Turns so it's probably correct but feel free to check. I am aware that this is not incorrect but I would like to confirm that it is redundant for my own sanity. It is referenced on the internet by both so it's not apparent whether one is more accurate or logical than the other.

Tim Hargreaves
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A turn as a unit is indeed dimensionless. But so is radian, and it's still used extensively. Such units are useful as bookkeeping devices, so it's better to use them when appropriate, although technically you could omit them.

As for your example with apples, you're being a bit incorrect. Mass of an apple is 100 grams per apple. So multiplying it by 10 apples gives you 1 kilogram, which is not ridiculous at all.

Ruslan
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It depends what you mean by real unit. It is not an SI unit: http://www.ebyte.it/library/educards/siunits/TablesOfSiUnitsAndPrefixes.html

So quite a lot of people wouldnt consider it a real unit. If for some reason a standard body in your country declares it a unit then it is for this country.

If a board of examiners which you have to respond to believes it is, then you better do yourself. At mist you could ask for an official reference.

lalala
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