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Find the magnitude of uniform electric f...

Find the magnitude of uniform electric field E of which the direction is shown in figure if an electron entering with velocity l00m/s making `30^(@)` comes out making `60^(@)` , after a time numerically equal to m/e ofelectron where m is mass ofelectron and e is electronic charge :

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PHYSICS GALAXY - ASHISH ARORA-ELECTROSTATICS-Unsolved Numberical Problems
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