In J.J Thomson's experiment, a magnetic ...

In `J.J` Thomson's experiment, a magnetic field of `4xx10^(-2)Wbm^(-2)` is used. If the electrons entering this field have a speed of `5xx10^(10)ms^(-1)`, what potential difference applied between the two plates `0.8 cm` apart will keep them undeflected ?

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1600 V

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