Recent content by Phillipe

Homework Statement Find the Thevening Equivalent Circuit for the following circuit: Homework Equations KVL, KCL. The Attempt at a Solution First of all, I calculate the current in the middle mesh, which I'll call i2: - j25 = ({i_2} - {i_1})(3 + j4) + {i_2}(10) where i1...

I think I just saw it. I get: e^2^x-e^x*2cos(3)-1 = 0 which stinks of quadratic equation.Things could get messy with that cos(3), though, but I'll take a shot. Thanks a lot, dude!

I have thought of using that, but I don't know how to get the values for x from there. Would you be so kind to tell me how?

Homework Statement Find all the values of Z which satisfy the equation, Z being a complex number in the form x+i*y. Homework Equations Every trig identity out there. The Attempt at a Solution Here's what I got so far: Cosh(z) = i*Cos(3) Cosh(x)*Cos(y)+i*(Sinh(x)*Sin(y)) =...

Oh, I see! You meant the surface density for the free charges in the plates, not the induced density in the dielectrics. Thanks a lot!

I didn't understand the last part. Does the Ki*V/d come from P=\epsilon0*Xe*E, which is equal to the surface density? I assume you're calling =\epsilon0*Xe "Ki", but in that case wouldn't it be Ki*V/(d*Ke), Ke being the dielectric's permitivity?

Thanks a lot. Just out of curiosity, how would the answer differ if the dielectrics were in parallel? I mean besides the voltage being the same for both instead of the sum.

Anyone?

Homework Statement We have two infinite conductor plates, with two dielectrics (with permitivities K1 and K2) put together between them so that the capacitor may be taken as two capacitors connected in series. We know that the maximum electric field for the first dielectric is Er1, and we also...