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The following diagram is the simplified version of an electron gun which is an integral part of cathode ray tube.  'A' is a filament and 'B' is a metal cylinder (i)  copy the diagram in your answer book.  Draw a pair of plates P1 and P2 to apply electric field, a screen S and an enclosure.  (ii)  What are the functions of A, B, P1 and P2?

Asked by Topperlearning User 4th June 2014, 1:23 PM
Answered by Expert


(ii)  Function of A : When A is heated it produces thermions.

Function of B is to collimate the thermions to a fine beam or to accelerate the thermions.  Function of P1 and P2 is to deflect the beam horizontally or vertically on the screen.


Answered by Expert 4th June 2014, 3:23 PM
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