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HW6Solutions

# HW6Solutions - Question 1 You're not given the distance...

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Question 1 You're not given the distance through which the electron is accelerated, so the approach suggested by J Z won't work for you. Still, you can find v, electron velocity as it enters magnetic field, recalling that qV = potential energy change = kinetic energy change = ½ mv². Of course, q = e, the electron charge, in this instance. Thus, v = √[2V (e/m)], where e/m is electron charge-to-mass ratio, 1.7588 E11 C/kg. Magnetic force you seek is F = q(v × B) = Bqv if v is perpendicular to B, as it is here. Using e instead of q, F = Bev = Be √[2V (e/m)]. All required data is known. Plug'n chug. On second thoughts, chug before you plug. Good luck! Question 2 Sodium ions (Na+) move at 0.794 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic field has a strength of 0.26T and makes an angle 70.3 degrees with the motion of the sodium ions. The arm contains 74.8cm3 of blood, (within the magnetic field) with 1.61 x 10^20 Na/cm3. If no other ions were present in the arm, what would be the magnetic force of the arm? Answer in units of N.

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HW6Solutions - Question 1 You're not given the distance...

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