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1978

Q:

Tungsten resistance to temperature rise?

  • 1
    decreases
  • 2
    increases
  • 3
    there is no change
  • 4
    All these
  • Show Answer
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Answer : 2. "increases"
Explanation :

At high temperatures, the tungsten filament gets hot and atoms in the filament vibrate more. The electrons in the current now collide more with the atoms & more energy is needed to push the current through the filament. Hence, the resistance of tungsten increases with temperature.

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