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Question

An electron is not deflected on passing through a certain region because :

A
there is no magnetic field in that region
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B
there is a magnetic field but velocity of the electron is parallel to the direction of magnetic field
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C
the electron is a charge less particle
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D
none of the above
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Solution

The correct options are
B there is no magnetic field in that region
D there is a magnetic field but velocity of the electron is parallel to the direction of magnetic field
An electron is not deflected on passing through a certain region because of two reasons :
1) there is no magnetic field in that region.
2) Even though t
here is a magnetic field but velocity of the electron is parallel to the direction of magnetic field.
Hence, options A, B are correct.

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