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Homework Statement
I'm a little confused.. When I write the equation of the circuit, do I have to keep the signs of the induced emf and self-inductance opposite?
I'll try to explain better my doubt:
Consider a coil that has resistance R and inductance L. Running a current will give rise to both an induced emf and self-inductance, and the situation is:
induced emf= -k
self-inductance= [itex]-L \frac{dI}{dt}[/itex]
Now, my question is: the equation of the circuit is given by:
[itex]-k -L \frac{dI}{dt}=RI[/itex]
or by
[itex]k -L \frac{dI}{dt}=RI[/itex] ?
The Attempt at a Solution
I think that the self-inducted emf fights the inducted emf so, self-inducted emf and inducted emf have ho have different signs and so the equation of the circuit is given by
[itex]k -L \frac{dI}{dt}=RI[/itex]. But I'm not sure. Could you help me?