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When a proton is ejected into a region where there is a magnetic field of B=2i-4kT...

When a proton is ejected into a region where there is a magnetic field of B=2i-4kT it experiences a force that is measured to be F=-4i+3j-5kN. What is the velocity of the proton? Write in a vector form.

use F = qv x B (cross product ijk

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