An electron beam is moving from left to right of the observer and magnetic field is acting vertically upwards. The direction of force acting on electron is

towards the observer

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away from the observer

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downwards

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upwards

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Solution

The correct option is B away from the observer
From Flemings's left hand rule, force on a positive charge moving from left to right and magnetic field being vertically upwards is towards the observer. If the charge is negative (example electron), force acts opposite to this direction i.e. away from the observer.

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Similar questions

An electron beam enters a magnetic field at right angles to it as shown in the figure.

The direction of force acting on the electron beam will be :

(a) to the left (b) to the right (c) into the page (d) out of the page

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