lecture23 - Self Inductance Self Inductance A variable...

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Unformatted text preview: Self Inductance Self Inductance A variable power supply is connected to a loop. The current in the loop creates a magnetic field. What happens when the power supply dial is turned down reducing the current, or turned up increasing the current? Self Inductance Self Inductance The current does not go from zero to /R in the circuit immediately after the switch is closed: 1. as the current flows through, magnetic flux through the loop is set up 2. this is opposed by induced emf in the loop which opposes the change in net magnetic flux 3. by Lentzs law, the induced E-field opposes the current flow Self Induction Self Induction R As a time-varying current flow through the conductor, the same thing happens: 1. as the changing current flows through, the magnetic flux through the loop changes 2. this is opposed by induced emf in the loop which opposes the change in net magnetic flux 3. by Lentzs law, the induced E-field opposes the current flow Self Induction Self Induction R Demo (From the Biot-Savart Law)...
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This note was uploaded on 01/13/2011 for the course PHYSICS Physics 1E taught by Professor Venus during the Winter '03 term at McMaster University.

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lecture23 - Self Inductance Self Inductance A variable...

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