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Question

The electrons in a particle beam each have a kinetic energy of 1.6×107J. What are the magnitude and direction of the electric field that stops these electrons in a distance of 10.0cm

A
103 v/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 A 103 v/m in the direction of velocity of electrons
W = FS
12mv2=EqS
1.6×1017=E×1.6×1019×10×102
E=103 V/m in the direction of velocity of electrons


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