lecture15 - Physics 2102 Gabriela Gonzlez Physics 2102...

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Physics 2102 Magnetic fields Physics 2102 Gabriela González
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Question Two charged ions A and B traveling with a constant velocity v enter a box in which there is a uniform magnetic field directed out of the page. The subsequent paths are as shown. What can you conclude? qB mv r = (a) F=qv x B. The vector v x B will point down when the charges enter the box; the force also points down for cw motion: charges must be positive. (b,c) r= mv/qB Same speed and B for both masses; larger radius for A than B. Ion with larger mass/charge ratio (m/q) moves in circle of larger radius. But that’s all we know! We cannot conclude b or c. (d) Is the right answer. (a) Both ions are negatively charged. (b) Ion A has a larger mass than B. (c) Ion A has a larger charge than B. (d) None of the above. v v A B FB= q v x B
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Crossed fields The figure shows four directions for the velocity vector v of a positively charged particle moving through a uniform electric field E (out of the page) and a uniform magnetic field B. Rank directions 1, 2, 3 according to the magnitude of
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This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture15 - Physics 2102 Gabriela Gonzlez Physics 2102...

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