24. Electric Force & Field; Gauss' Law
Electric Fields in Capacitors
14:22 minutes
Problem 23b
Textbook Question
Textbook QuestionINT Electrostatic cleaners remove small dust particles and pollen grains from air by first ionizing them, then flowing the air between the plates of a parallel-plate capacitor, parallel to the plates, where electric forces deposit charged particles on one of the electrodes. A typical pollen grain has a mass of 5.0×10^−10 g, the ionizer charges it with 750 extra electrons, and a fan moves the air at 3.0 m/s. Ignore air resistance and gravity. b. What minimum electric field strength is needed to deflect the grain by 3.0 mm before it leaves the electrodes?
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