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Consider one design of electron gun, whi...

Consider one design of electron gun, which has a barrel of length 1 m made of an insulating material. At one end of the barrel, a filament is electrically heated so that it emits electrons. Assume these electrons are emitted with a the sides negligible speed. What electric field should be applied parallel to the barrel so that electrons may achieve speed of light before leaving the barrel? Ignore the variation of mass of electron due to its speed.

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`2.56xx10^5` N/C
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MODERN PUBLICATION-ELECTRIC CHARGES AND FIELDS -Practice Problems
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