Question 168321
 Any help with the folllowing assignment question would be most appreciated. I am doing an electrical degree course which is moving too fast over the quantitative analysis section and I am struggling to take basics for each topic. 
two coils connected in parrallel
r1= 12 ohm L1= 24mH
r2= 6 ohm L2=30mH
given that f = 50Hz calculate the values of impedance for each coil Z1 and Z2 and the total impednace for two impedances in parrallel in both polar form and rectilinear form. 
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Start with the formula for inductive reactance, which corresponds to resistance of the inductor at a specific frequency:
X = 2*pi*f*L where f is in Hz and L is in Henries
L1 = 0.024 Henry
X1 = 2*pi*50*0.024 = 7.54 ohms
r1 = 12 ohms (I assume this is the resistance of the coil) so it's in parallel with the coil.
That's 4.63 ohms (at 50 Hz)
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L2 = 0.03 Henry
Same as above, X2 = 9.24 ohms
In parallel with 6 ohms gives 3.71 ohms.
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In parallel, their reactance at 50 Hz is 2.06 ohms.
I don't see anything to be plotted in rectilinear or polar form, it's just a number of ohms.