Charges, Currents, and Magnetic Fields- Prelab Name: Date: Question: How do magn

Question

Charges, Currents, and Magnetic Fields- Prelab Name: Date: Question: How do magnetic fields act on moving charges? Part P-1: When a moving charge is exposed to a magnetic field, the field exerts a force on the charge given by F= qv x B where q charge, v = velocity, and B = magnetic field. 1) In the figure above, a negatively charged particle (black dot) is moving in the direction indicated. A uniform magnetic field is directed into the page (a number of field lines have been indicated). a) what is the direction of v × B? b) What is the direction of the force on the moving charge? Charges, Currents, and Magnetic Fields-8.1 Last Revised 05/26/2015

Explanation / Answer

a) the direction of v X B will be perpendicular to v and B

so it is to the left

b) F = q(vXB)

since the charge is negatively charged , so it will move to the right

c) the force does not change with time

d) The charge will move in a circular path

e) The speed does not change because the charge moves in a uniform circular motion and the force acting becomes equal to the centripetal force

f) Yes the velocity changes . because the speed is constant but the direction changes as it acts tangentially to the circular path

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