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A uniform magnetic field is in the positive z direction. A positively charged particle is moving...

A uniform magnetic field is in the positive z direction. A positively charged particle is moving in the positive x direction through the field. The net force on the particle can be made zero by applying an electric field in what direction?

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Answer #1
if it moving in z direction means k^
and its velocity is x direction means i^
so cross product of velocity and magnetic field is i^cross k^ gives -j^ negative y direction
so the force is in this side
so electric field has to be applied in the positive y direction +y direction

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