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Sodium ions (Na+) move at 0.860 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic field has a strength of 0.258 T and makes an angle of 61.0° with the motion of the sodium ions. The arm contains 120 cm3 of blood with a concentration of 4.00 1020 Na+ ions per cubic centimeter. If no other ions were present in the arm, what would be the magnetic force on the arm?

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