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lecture24 - Self Inductance Self Self Inductance A current,...

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Self Inductance Self Inductance
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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
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The current does not go from zero to  ε /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 Lentz’s law, the induced E-field opposes the        current flow Self Induction Self Induction R
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As  a tim e -varying  c urre nt flo w thro ug h the  c o nduc to r, the   s am e  thing  happe ns :   1. as  the  c hang ing  c urre nt flo ws  thro ug h, the  m ag ne tic          flux thro ug h the  lo o p changes   2. this is opposed by induced emf in the loop which  
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