HARD
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While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?
(a)Dust particles are present in air
(b)Carbon dioxide is present in air
(c)Air is a poor conductor of electricity under normal conditions
(d)None of the above

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Important Questions on Physics
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Which of the following is a landlocked country?

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The shape of the path of free electron in a metal is _____:

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What will be the direction of the magnetic field at the very bottom point of a horizontal power line, where the current flows from east to west when viewed from the west end?

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The flow of _____ is anti–clockwise in the given circuit:

