Solenoid Question

[Pontiuth Pilate]

I have to find the number of turns in a solenoid :\

I have a voltage probe, a magnetic field sensor and a power amplifier... How do I do it?

I could use the B = unI equation, but I don't know the length of the solenoid wire...

 

[Kozmos]

As a student of electrical engineering I should feel obliged to respond. But I dont. Unless you pay me.

Seriously I learned this but I forgotten.

 

[Mise]

The strength of the B field is proportional to the number of turns PER UNIT LENGTH - therefore there's no way you can determine the absolute number of turns without first knowing the number of turns per unit length. Hence, the question is probably asking for n, so you can use the B=u0nI equation. All the "equipment" you're given backs this up - you know B directly, and I indirectly through V and P.

 

[Pontiuth Pilate]

No, it says "determine the number of loops of wire that the solenoid has."

Yeah, I can find B pretty easily, and I can set the current to whatever I want, so I can find the turn density... the question is how to go from that to # turns, or perhaps I'm on the wrong path from the start...

 

[Kozmos]

Simply count the number of loops man. That is the n variable.

 

[Mise]

Well, my thinking is, there's nothing more that you can do to determine N.

If you were to take the solenoid, and move it in and out, like an accordian, the strength of B would increase and decrease. You can't determine anything else from the equipment you have, and a ruler is pretty standard stuff so I'd say just measure it... I really can't think of any other way of doing it than what you've already thought of.

 

[Chairman Meow]

This is an experimental setup, with an actual solenoid, right? Just measure its length.