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RL Circuits - Engineering

Q1:

A 470  resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is

A 12.60 –76° mS

B 12.1876° mS

C 218 –76° mS

D 12.18 –76° mS

ANS:D - 12.18 –76° mS

Y= 1/R + (1/jX).
Y = 1/470 + 1/j*2π*1.5k*200m.
Y = 2.12 - j 0.5351 mS.
Y = 2.19 <-14 or 2.19 <76.