Why the deflection in a magnetic field of electron is clockwise and alpha particle is anticlockwise.
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magnetic field and force
Moving charges in a magnetic field experience a force.
Fleming’s left hand rule tells you the direction of the force if you know the directions of the electric current and the magnetic field.
Explanation:
Similarly if you know the direction of the force and the direction of the magnetic field then you can infer the direction of the electric current. Since alpha and beta particles are charged they make up a very small electric current.
The trick is to see whether the direction of the current you come up with from using Fleming's left-hand rule is the same as the direction you know the particles are moving in (because you know they come from the source).
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