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A positron (q = +e) moves at 4.000 ×107 m/s in a magnetic field of magnitude...

A positron (q = +e) moves at 4.000 ×107 m/s in a magnetic field of magnitude 0.5100 T, The magnetic force on the positron has magnitude 1.600 ×10−12 N

. Give your answers in scientific notation.

What is the component of the positron's velocity parallel to the magnetic field?

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Answer #1

Here only perpendicular component of velocity is responsible for force because the force is the cross product of velocity and field so parallel component does not contribute.

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