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In Thomson's experiment to determine e/m...

In Thomson's experiment to determine e/m of an electron, it is found that an electron beam having kinetic energy of 45.5 eV remains undeflected, when subjected to crossed electric and magnetic fields. If `E=1xx10^(3)Vm^(-1)`, the value of B is (mass of the electron is `9.1xx10^(-31)kg`)

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