The value of can be B me obtained by using a specially designed vacuum tube...

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The value of can be B me obtained by using a specially designed vacuum tube The figure contains a heated filament F and an anode A which is maintained at a positive potential relative to the filament by a battery of known voltage v Electrons get emitted from the heated filament and are accelerated towards the anode which has a small hole in the centre for the electrons to pass through into a region of constant magnetic field B which points into the plain of the paper The electrons then move in a semicircle of diameter d hitting the detector cathode as A F

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