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!

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Math Inductance help

**Physics Forums | Science Articles, Homework Help, Discussion**