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

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Magnetism B exerts force on moving charges: F = I l × B d F = I d 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 direction. – 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 = µ 4 π q v × r r 2 B = µ 4 π Id l × r r 2 • We will use d B = µ 4 π 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 Coulomb’s Law for E : d B = µ 4 π Id l × ( r − r ± ) | r − r ± | 3 d E = 1 4 π± dQ ( r − r ± ) | r − r ± | 3 Id l and dQ play analogous roles. – p....
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