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Magnetic field Q Watch

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    the answer to part b) is eE = Bev so therefore E=Bv and v=E/B

    Why is this the answer? I am confused..

    Thanks
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    It will only continue in a straight line when the resultanf=t force on it is zero.

    ie the electric and magentic forces are equal and opposite.
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    (Original post by teachercol)
    It will only continue in a straight line when the resultanf=t force on it is zero.

    ie the electric and magentic forces are equal and opposite.
    Thanks! PRSOM
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    Referring to the equation: isn't it also because the the forces by the magnetic and electric field are in opposite directions (and equal magnitude), so F=Eq (E field force) and F=Bqv (mag field force) need to be the same. Charge is electron so q=e so Ee=Bev.
 
 
 
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