* 65. (I) A long thin solenoid has 430 loops of wire per
Chapter 20, Problem 65(choose chapter or problem)
* 65. (I) A long thin solenoid has 430 loops of wire per meter, and a 25-A current flows through the wire. If the permeability of the iron is 3000/xu, what is the total field B inside the solenoid?
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