Lecture25

# Lecture25 - 1 March 5 2008 Physics 132-Winter 2008 Prof Jim...

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Unformatted text preview: 1 March 5, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 25 March 5, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Inductors Capacitance : how much charge we store for a given potential difference (self) Inductance: how much magnetic flux we store for a given current. C = q V L = N Φ i Solenoid with current i: Φ = BA N = nL B = μ o in L = N Φ i = ( n )( BA ) i = ( n )( μ o in ) A i = μ o n 2 A Units of L: Henry [ Henry ] = [ Tesla • m 2 ] [ Ampere ] 2 March 5, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Changing the Current in an Inductor i B Change i for an inductor. Faraday’s Law: EMF = − N d Φ dt = − d ( Li ) dt Self-inductance: EMF = − L di dt L = N Φ i An inductor generates an EMF due to changes in its own magnetic field. In a circuit loop equation, an inductor gives a voltage change of -L di/dt in the direction of the current. For constant current, an inductor is like a wire. A sudden change in current produces large EMFs....
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## This note was uploaded on 04/18/2008 for the course PHYS 132 taught by Professor Beatty during the Winter '08 term at Ohio State.

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Lecture25 - 1 March 5 2008 Physics 132-Winter 2008 Prof Jim...

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