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lecture24 - Self Inductance Self Self Inductance A...

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Self Inductance Self Inductance
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A variablepower supply is connected to a loop. Thecurrent in theloop creates a magnetic field. What happens when the power supply dial is turned down reducing the current, or turned up increasing thecurrent? Self Inductance Self Inductance
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Thecurrent does not go from zero to ε /R in the circuit immediately after the switch is closed: 1. as thecurrent flows through, magnetic flux through theloop is set up 2. this is opposed by induced emf in the loop which opposes the change in net magnetic flux 3. by Lentz’s law, theinduced E-field opposes the current flow Self Induction Self Induction R
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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 Lentz’s law, theinduced E-field opposes the current flow Self Induction Self Induction R
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(From the Biot-Savart Law) The
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