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
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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- Spring '11
- Ghosh
- Inductance, Trigraph, DI, th ro ug
-
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