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## Homework Statement

find Vx for all t

inductor assumed to have no energy stored

[PLAIN]http://img651.imageshack.us/img651/773/circuitgt.jpg [Broken]

## Homework Equations

inductor v = L di/dt

unit step = 1 for t>0,

= 0 for t<=0

## The Attempt at a Solution

using node voltage method, ground at the bottom, and "v1" for the top node

v1 = Ldi/dt ?

(v1 - .8 vx)/40 - 100u(t) + v1/60 = 0

2.5 v1 - 1.2Vx = 6000 u(t)

i fail.

Help anyone?

## Homework Statement

## Homework Equations

## The Attempt at a Solution

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