Physics_9HD_Final_Exam_Review

# Physics_9HD_Final_Exam_Review - Physics 9HD Final Exam...

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1 Physics 9HD Final Exam Review Electromagnetic Induction Faraday’s Law: E = Φ = a d B dt d c dt d c B r r 1 1 Lenz’s Law: The direction of the induced current is such that its magnetic field acts to oppose the change in the field which caused the induced current. Eddy currents are induced in bulk conductors when they are in a changing magnetic field. For example, such currents will act to oppose the motion of a moving conductor through a magnetic field. Motional EMF: E × = s d B v c r r r ) ( 1 Electric generator: Mechanically turn the armature of the DC motor in the magnetic field to generate a current in the armature windings. Inductance Mutual inductance: 2 1 1 1 2 2 cI N cI N M B B Φ = Φ = , since E 2 dt dI M 1 = and E 1 dt dI M 2 = Self-inductance: E dt dI L = , cI N L B Φ = Cgs units for inductance in the equations above are cm 2 sec ; to convert to henrys, multiply by 2 9 10 c To find self-inductance of particular geometry: (1) find magnetic field by Ampere’s Law, (2) find magnetic flux through inductor, (3) multiply by N/cI to find L in cm 2 sec , (4) convert to henrys by multiplying by 2 9 10 c .

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## This note was uploaded on 03/01/2012 for the course PHY 9HD taught by Professor Curron during the Fall '11 term at UC Davis.

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Physics_9HD_Final_Exam_Review - Physics 9HD Final Exam...

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