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Finding the resistance of a solenoid?by mattattack
Tags: resistance solenoid 
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#1
May712, 03:59 AM

P: 15

I have a solenoid with 180 turns, which is 10 cm long. It has a half core of magnets (which could be constituted as part iron core). The magnetic field strength was measured to be 0.004982 T inside the solenoid around the middle when 12v was run through it and 0.004512 without power running through it. To work out the theoretical magnetic field, I have to use Ampere's law:
B=μ x N x I B = 8.75x10^4(because of the iron core)x180x(current in amps) The problem is I don't have the current in amps. But I thought I could use Ohm's law: V= IR and changed it to I= V/R I need the resistance without measuring it, but I don't know how to get it. 


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