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A beam of electrons enters a pair of croseed electric and magnetic fields in which the electric field strenght of 3.0*104 V m^-1 and magnetic flux density of 1*10^-2 T. If the beam is not deflected from its path by the fields, what must be the speed of the electrons?

Thanks!

  • physics -

    e V B must equal e E

    That means V = E/B = 3*10^4/1*10^-2

    The answer will be in m/s for the SI units you are using for E and B

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