Q 1114301250.     In Thomson's experiment to determine `e/m` of an electron, it is found that an electron beam having a kinetic energy of `45.5 eV` remains undeflected, when subjected to crossed electric and magnetic fields. If `E=1xx10^3Vm^-1`, the value of `B` is (mass of the electron is `9.1xx10^(-31)kg)` :

A

`2.5xx10^-3 Wbm^-2`

B

`5xx10^-4 Wbm^-2`

C

`2.5xx10^-4 Wbm^-2`

D

`1xx10^-4 Wbm^-2`

HINT

If beam is passed undeflected, net force on electrons must be zero.

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