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JAMB Physics 2010 Question 45

Question 45

Conduction through Liquids and Gases

In a discharge tube, most of the gas is pumped out so that electricity is conducted at

  1. A.steady voltage.
  2. B.low pressure.
  3. C.high pressure.
  4. D.low voltage.
Show the answer and explanation

Answer: B (low pressure.)

Explanation

Gases conduct electricity well only at low pressure (with a high voltage), so most of the gas is pumped out of a discharge tube.