Q.

An electron moving horizontally from left to right in a region where a magnetic field exists vertically downwards describes: (when seen from above)

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a

vertical clock-wise circular path

b

horizontal clock-wise circular path

c

vertical anti clock-wise circular path

d

horizontal anti clock-wise circular path

answer is A.

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Detailed Solution

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F=q(v×B)

F=-e(v×B)

The direction of force will be clockwise in horizontal plane. So, the path will be clockwise circular in horizontal plane.

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