A neutron, a proton, an electron and an -particle enter a region of uniform magnetic field with the same velocities. The magnetic field is perpendicular and directed into the plane of the paper. The tracks of the particles are labelled in the figure. The electron follows the track
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A neutron is electrically neutral particle. It will pass undeflected, therefore it follows track .
Electron is a negatively charged particle.
According to Fleming's left hand rule, the magnetic force on the electron will be towards right. Therefore, it follows track .
Proton and alpha particle are positively charged particles. In accordance with Fleming's left hand rule magnetic force on these particles will be towards left. Among the tracks and
, one is of proton and other of
-particle.
As
Therefore, particle follows track
and proton follows track
.
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