21_Chapter 19 HomeworkCH19 Magnetism

# 21_Chapter 19 HomeworkCH19 Magnetism - Magnetism 19.47 N...

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Magnetism 161 19.47 The magnetic field inside a long solenoid is 00 N I L µµ  ==   Bn . Thus, the required current is I ( )( ) () 4 2 -7 0 1.00 10 T 0.400 m 3.18 10 A 31.8 mA 4 10 T m A 1000 BL I N µ π × = ×⋅ 19.48 (a) From RL A ρ = , the required length of wire to be used is 2 3 8 5.00 0.500 10 m 4 57.7 m 1.70 10 m RA L  Ω×   = ×Ω The total number of turns on the solenoid (that is, the number of times this length of wire will go around a 1.00 cm radius cylinder) is 2 57.7 m 919 2 21 . 0 01 0 m L N r = × (b) From B 0 n I = , the number of turns per unit length on the solenoid is 2 3 -7 0 4.00 10 T 7.96 10 turns m 41 0 T m A 4 . 0 0 A B n I × Thus, the required length of the solenoid is
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## This document was uploaded on 10/20/2011.

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