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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Physics_9HD_Final_Exam_Review - Physics 9HD Final Exam...

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