Electric Circuits
The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

 400 Ω.
 800 Ω.
  40 Ω.
 4 Ω.

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Electric Circuits
A pole of driving point impedance is

 zero current for a finite value of driving voltage.
 zero voltage for a finite value of driving current.
 zero voltage for a finite value of driving voltage.
 zero current for a finite value of driving current.

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