Lec-11 - the next one. p. Magnetic Fields and Forces The...

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Magnetism B exerts force on moving charges: F = I l × B d F = Id l × B F = q v × B Moving charges ( i.e, I ) create B – p.
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First Hour Exam Exam Thurs., Oct. 4 at 4:10 pm covers Reading assignments through chapter 27 Lectures through dc motor demo (today) Homework through HW-11 Extra time students: LL 221; everyone else: Packard 101 A practice exam and solution are posted on the web. Scheduling changes: Review session Wed., Oct. 3 at 7:00 pm in LL270 No morning lecture Thursday, Oct. 4 No homework assignment due Friday, Oct. 5 – p.
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Torque on a Current Loop – p.
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Simple dc motor The current reverses at the right time so that the torque keeps the armature spinning in the same – p.
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End of Material for HT-1 Don’t go to sleep . . . if it’s not on this test, it will be on
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Unformatted text preview: the next one. p. Magnetic Fields and Forces The force B exerts on a moving charge led us to the force B exerts on a current. F = q v B F = I l B The magnetic field B created by a moving charge leads us to the field created by a current. From the text: B = 4 q v r r 2 B = 4 Id l r r 2 We will use d B = 4 Id l ( r r ) | r r | 3 p. B of a Moving Charge p. B of a Current Element p. Biot-Savart Law The Biot-Savart Law for B looks a lot like Coulombs Law for E : d B = 4 Id l ( r r ) | r r | 3 d E = 1 4 dQ ( r r ) | r r | 3 Id l and dQ play analogous roles. p....
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This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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Lec-11 - the next one. p. Magnetic Fields and Forces The...

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