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physics and chemistry doubts!!

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what is the best thing to write in ans for... why does the dust particles does not settle down in brownian motion ?
 
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Well, I think it is.
And the reason being that to discharge electrons from the cathode, a very high voltage is required, which eliminates A and B.
Also, since in a cathode ray, the two electrodes are fixed... ie cathode and anode do not change → unidirectional current is used.
Which means dc aka D.
 
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when electricity is transmitted through large distance what is the voltage ( high r low) nd type of current ( ac or dc) ?
 
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