If the electron enters at right angle into the magnetic field as shown in figure, then the direction of force is

out of the plane

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into the plane

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Downward

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Upward

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Solution

The correct option is C Upward
Direction of magnetic force can be calculated by two method.
$1.$ Flemming left hand rule.
$2.$ Right hand palm rule.
According to flemming left hand rule if fore finger is placed in
direction of magnetic field, middle finger in direction of positive
charge or opposite to motion of negative charge then thumb will represent direction of magnetic field.
So, option $D$ is correct.

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