# Homework #2

*For ph461/ph561 complete questions 1, 2 and 3.*

*Students taking ph505 (additional 1 credit graduate class) should complete questions 1, 2, 3 plus the “Extra question for ph505 students”*

*Due Friday, October 8, 2010 at 5pm*

#### Reading assignment

Chapter 4 of R,H&B.

#### Q1: Circuit analysis (10 pts)

*Wikipedia article on electrical impedance, note that the symbol j is used instead of i.*

Consider the ac circuit below.

**a)** What is the total impedance?

**b)** If the frequency ω is chosen so that ω = 1/sqrt(*LC*), then what is the phase lag between the current and the voltage?

#### Q2: Convergence (15 pts)

#### Q3: Convergence II (10 pts)

#### EXTRA QUESTION FOR PH505 STUDENTS (10 pts)

Choose between **either** Question 25.1 of R,H&B **or** Question 4.17 of R,H&B.