PHYS 221 General Physics II - Calculus Supplement Grist Homework Solution “The Magnetic Force” Problem:An electron moves in a circular orbit (according to the Bohr model of the atom) around a proton of radius 5.3 X 10-11m with a velocity of 2.2 X 106m/s. What magnetic field is produced at the proton? Remember, the magnetic field is a vector, so be sure to give the magnitude and direction. Solution: The magnitude of the magnetic field is given by the relationship: 24oqvBrµπ=JGwhere 6126 10.oTmA−⋅=×Putting in our values gives: ()61962111201610221045310....mCAsBm−−−⋅⎛⎞⎛⎞×××⎜⎟⎜⎟⎝⎠⎝⎠==×12.6TThe direction is given by the cross-product of the velocity of the charge (the electron) and the
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