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An electron gun fires an electron beam of kinetic energy E with a very small...

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An electron gun fires an electron beam of kinetic energy E with a very small divergence angle 0 To focus all the electrons to one point a magnetic field induction B is applied along the direction of propagation of the electrons If the mass and charge on a electron are m and q respectively then minimum distance x shown in figure at which the ME electrons focus is nx aR then value of n is X

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