Measuring e/m

IB Physics: Measuring e/m

In 1897 J. J. Thomson is said to have discovered the electron by realising that the rays emitted from a hot wire travel much further through air than if they had been atoms[1]. Following on from this discovery he measured their charge to mass ratio (e/m) by deflecting a beam of electrons with electric and magnetic fields. In this investigation the deflection of electrons with electric and magnetic field will be investigated...


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