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Q#1
Transient Analysis
GATE EE 2005
MCQ
+2 marks
-0.66 marks
A coil of inductance 10H resistance 
is connected as shown in figure. After the switch S has been in connected with point 1 for a very long time, it is moved to point 2 at t=0
If, at t = 0+, the voltage across the coil is 120V, the value of resistance R is:
0 Ω
20 Ω
40 Ω
60 Ω
Explanation:
For t<0, the switch is connected in Position 1 as shown below,
Since the circuit is at steady state the inductor behaves
as short circuit
Current at t<0, 
Current doesn’t change abruptly in inductor
At 
, the inductor behaves as constant current source.
Voltage across coil at 
=Voltage across 
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