[ashuto]

I am struggling on part (b), especially when adding two Zs together.
Attempted solution.
(a) \( Z_1 \) = 20 @ 0.8 lag = 20 cos^-1(0.8) = 20∠36.87 Ω
Z_2 = 20 @ 0.6 lead = 20 sin^-1(-0.6)=20∠-53.13 Ω

(b) When in series.
Z=Z_1+Z_2 = 20∠36.87 + 20∠-53.13
I don't know how to add these.

On another note: How do I write math code here?

[ashuto]

Extra: In which subsection does this problem fall into? You may chose only one. Note that you won't be given mark if you chose none but penalty may be given if the wrong answer is chosen.
a) Electric Fields
b) Current of Electricity
c) D.C. Circuits
d) Electromagnetism
e) Electromagnetism Induction
f) Alternating Current

What do you think?

[ashuto]

Answer for b) is 28.28∠-8.13 ohm. I wonder how they get that. I tried to convert the polar into complex first but the answer is wrong.