A uniform magnetic field b-20mt z acts on a -50nc charge, Ask an Expert

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A uniform magnetic field, B=-20mT z^ acts on a -5.0nC charge with mass 1.0g travelling with velocity v=(-2,2, 1 )m/s.

654_A uniform magnetic field acts on a charge.png

a) What is the component of the velocity in the direction parallel to the magnetic field?

b) What is the component of the velocity perpendicular to the magnetic field?

c) The electron will travel in a spiral (also called a helix). Why? What is the direction of axis of the spiral? How far along the axis will the electron progress in the time it takes to make one loop of the spiral? (In other words, what is the pitch, p, of the spiral?)

d) Calculate the radius r of the trajectory.

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