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Q#1
Sinusoidal Steady State Analysis
GATE EE 2005
MCQ
+2 marks
-0.66 marks
The RL circuit of Figure is fed from a constant magnitude, variable frequency sinusoidal voltage source 
. At 100 Hz, the R and L elements each have a voltage drop 
. If the frequency of the source is changed to 50 Hz, the new voltage drop across R is:
Explanation:
Let inductive reactance at 100Hz is 
Since voltage drop across R & L is equal at 100Hz
Magnitude 
RMS voltage across 
Now at 50Hz
Inductive reactance=
Current at 50Hz 
RMS voltage drop across R at 50Hz=
Now from equation (4) & (2)
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