HW__8_P213_S08

# HW__8_P213_S08 - Physics 213 Read Homework#8 Spring 2008...

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Physics 213 Homework #8 Spring 2008 Read: Chapter 28, intro., sections 28.1 thru 28.7 For practice: Chap. 28: Q's #Q28.1-3, 5-15 (not quizzed) E's & P's #28.9, 13, 21, 25, 31, 33, 39, 45, 59, 63, 69, 73, 75, 81 To be prepared for your 2nd recitation class the week of March 26-28: Question #Q28.8 [Two Loops] Problem #28.60 [Two Wires] #28.67 [Helmholtz Coils] #28.88 [Semicircle Wire] A rectangular wire loop of dimensions D and H that carries electric current I 2 is situated a distance y directly beneath a long straight horizontal wire that carries current I 1 , as shown . (a) What is the net magnetic force (magnitude and direction) acting on the rectangular loop due to the current I 1 in the long straight wire? (b) What is the direction of the magnetic force acting on each segment of the rectangular loop due to the current I 2 in the other 3 segments? What do these forces try to do to the loop? (c) If the rectangular loop has total mass m and is situated directly beneath the long wire, at what distance y does the loop experience zero net force (including its own weight)? Is this a position of stable or unstable equilibrium? Please explain. #2. ["Coax" Cable] A coaxial cable (or "coax") consists of an inner solid cylindrical conductor of radius "a" carrying electric current I to the right, surrounded coaxially by a thin cylindrical conducting shell of radius "b" carrying the

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HW__8_P213_S08 - Physics 213 Read Homework#8 Spring 2008...

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