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6 In an experiment, the electron are accelerated by potential difference of 2000v. The same potential difference of V gun is applied across the plate

6 In an experiment, the electron are accelerated by potential difference of 2000v. The same potential difference of V gun is applied across the plate which is 20cm apart. The magnetic field B needed to balance the forces on the electron beam is 9,2xX10 Tesla. Find charge to mass ratio. 

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