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The earth is constantly bombarded by cosmic rays, which are charged particles from outer space. Find the force on one such cosmic ray? a proton that is instantaneously moving vertically downward at 5.27 X 107 m/s at a point outside the atmosphere over New York, where the magnetic field dips 74.0o below the horizontal and has a horizontal component of1.70 X 10-5 T (see figure below).

2166_The earth is constantly bombarded by cosmic rays.gif

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