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chemic_23
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Homework Statement
hi, i just have few questions on how to make a 30mH-inductor (solenoid). I have an enameled copper wire which i will wrapped into a 7-inch rebar having 12mm diameter. In order to determine the number of turns, i made some calculations:
Homework Equations
L=(uAN^2)/d
The Attempt at a Solution
My computations are as follows:
L=30e^-3 H
u=100*4*pi*10^-7 (permeability of the rebar=100 (just an assumption))
A=pi*(6e^-3) m^2 (r=12mm/2=6mm=6e^-3 m)
d=0.1778 m
N=613 turns
my question is:
-how will i know what is the thickness of the copper wire I'm going to use?
-and, is my permeability assumption correct? (i don't really know what is the exact permeability of the rebar)
some photos of rebar:
http://www.circlecityrebar.com/istock_rebar6.jpg"
http://rebar.materialsuppliers.com/Rebar-big.jpg"
please help thanks!
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