Question1
A uniform electric field of magnitude 642 N/C exists between two parallel plates that are 4.06 cm apart. A proton is free from rest at the positive plate at the same instant an electron is released from rest at the negative plate.
(a) Find the distance from the positive plate at which the two pass each other. Overlook the electrical attraction between the proton and electron.
(b) Repeat part (a) for a sodium ion (Na+) and a chloride ion (Cl-).
Question2
Sodium ions (Na+) move at 0.865 m/s through a bloodstream in an arm of a person standing near a large magnet. The magnetic field has strength of 0.255 T and makes an angle of 30.0° with the motion of the sodium ions. The arm contains 150 cm3 of blood with a concentration of 2.50×1020 Na+ ions per cubic centimetre. If no other ions were present in arm, what would be magnetic force on the arm?