A vertical wire carries a current in upward directon. If an electron beam sent horizontally towards the wire, then it will deflectedVertically downwards and perpendicular to the plane of the paperVertically upwards and perpendicular to the plane of the paperIn the plane of the paper No deflection
Question
A vertical wire carries a current in upward directon. If an electron beam sent horizontally towards the wire, then it will deflectedVertically downwards and perpendicular to the plane of the paperVertically upwards and perpendicular to the plane of the paperIn the plane of the paper No deflection
Solution
The direction of deflection of the electron beam can be determined using Fleming's Left Hand Rule. According to this rule, if we stretch our thumb, forefinger and middle finger of our left hand such that they are mutually perpendicular to each other, with the forefinger pointing in the direction of the magnetic field (which is from south to north around the wire), the thumb pointing in the direction of motion of the electron (which is opposite to the direction of the current in the wire as electrons move from negative to positive), then our middle finger will point in the direction of the force experienced by the electron.
In this case, the current is upwards, so the magnetic field around the wire is anticlockwise. The electron beam is moving towards the wire, so if we align our left hand accordingly, we find that the middle finger (indicating the direction of force on the electron) points downwards. Therefore, the electron beam will be deflected vertically downwards.
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