The electrons in a particle beam each have a kinetic energy of 1.6×10−7J. What are the magnitude and direction of the electric field that stops these electrons in a distance of 10.0cm
A
103v/m in the direction of velocity of electrons
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B
103 v/m positive direction of velocity of electrons
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C
103 v/m perpendicular to velocity of electrons
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D
106 v/m perpendicular to velocity of electrons
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Solution
The correct option is A103v/m in the direction of velocity of electrons W = FS 12mv2=EqS 1.6×10−17=E×1.6×10−19×10×10−2 E=103V/m in the direction of velocity of electrons