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Unformatted text preview: Ch. 28 Biot-Savart: ~ B = 4 R Id ~ l r r 2 outside straight conductor: B = I/ (2 x ) inside: B = I 2 R r R parallel conds: F/L = I 1 I 2 / (2 r ) B at center of circular current loop: B = NI/ (2 a ) for N loops Amperes Law: H ~ B d ~ l = I encl = R ~ j d ~ A inside solenoid: B = nI (n: turns/length) B toroid = NI 2 r Ch. 29 motional emf: V = vBL Faradays Law: V loop =- d B dt =- d dt R surf ~ B d ~ A Changing B, no motion: V loop =- N dB dt A for N loops Lenzs Law: induced currents produce flux to oppose the original change in B induced E field: E = 1 2 r d dt AC generator: B = N ~ B ~ A = NBA cos( t ) V =- d B dt = NBA sin( t ) mag dipole of orbiting particle: = evr 2 = e 2 m L (L = ang. mom.) mag materials: ~ B inside = ~ B + ~ M , where mag- netism ~ M = ~ tot /V B inside = K m B = (1+ m ) B ( K m : relative perme- ability (near 1), m : mag susceptibility) m : dia =- 10- 5 , para = 10...
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This note was uploaded on 04/01/2008 for the course PHYSICS 260 taught by Professor Evrard during the Fall '07 term at University of Michigan.
- Fall '07