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OpenStudy (anonymous):
F=q(vxB) F is also equal to m*dv/dt if there is a moving particle and B is in the z direction show that v and F are perpendicular and constant magnitude hint given for problem: find d/dt (v (dot) v)
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OpenStudy (anonymous):
just by definition of the cross product I know F must be perpendicular to the v and B vectors but I don't know how to show it
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