I'm having some problems with inductances and I want to know on i) what is the value of L at its terminals for t<0...(adsbygoogle = window.adsbygoogle || []).push({});

I did an equivalent circuit of the original one when t=0 and this circuit consists of the inductor and R2+R3 in series...

I considered t(seconds)<0 and the L acts like a short Circuit

thats gives me the inical current of L which is -10ma.

Then I used the following formula : L *di/dt + Ri <=> di/i=-R/L *i * dt

integer of i(t) i(t0) dx/x = -R/L integer (t) (t0) 1dy

ln( i(t)/i(0) ) = -R/Lt

i(0+)=i(0-)=I=Io

i(t)= Io * e^-((R/L)t)

http://i75.photobucket.com/albums/i281/esmeco/inductance.jpg [Broken]

Is this okay?Thanks in advance for the help!

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# Math Inductance help

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