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College Physics

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A charged particle travels undeflected through perpendicular electric and magnetic fields whose magnitudes are 4000 N/C and 20 mT,respectively.
Find the speed of the particle if it is a proton.
v= m/s
Find the speed of the particle if it is an alpha particle. (An alpha particle is a helium nucleus-a positive ion with a double positive charge of +2e.)
v= m/s

  • College Physics - ,

    If there is no deflection, qE = q v B
    with E and B oriented perpendicular to each other and the particle velocity. q is the charge of the particle.

    v = E/B

    The speed will not depend upon the charge or mass.

    I assume your 20 mT field is milliTesla, not megaTesla.

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