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## Homework Statement

Question 2 on this paper:

http://www.eng.cam.ac.uk/teaching/past_papers/examples_student/examples_IA/P3_LCD_Q/1ap3lcdq003

## Homework Equations

Z = V/I

V=L di/dt

## The Attempt at a Solution

for part a of the question:

I began with V = Vo cos(wt)

And I = Io cos (wt + k)

I expressed them as exponentials' real parts using Euler's relation:

Z = V/I

So, Z = [Vo (e^(-jk))]/Io

I don't know what to do further.

I've looked around the internet and apparently that leads to

Z = R + jX

So, the answer for the part a would be 10 + j10

But how?

Thanks