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Introductory Physics Homework Help
Solving Two Charged Plates Homework: Magnetism, Frequency & Charge Density
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[QUOTE="VKint, post: 6002338, member: 176160"] As others here have noted, you don't seem to fully understand the meaning of ##r## in Coulomb's formula ##E = KQ / r^2##. The ##r## in this problem is something else. (Hint: Think centripetal acceleration.) You've got another incorrect formula in part (1). Think simpler--the electric field exerts a force on the proton; so does the magnetic field. These forces are given by the definition of the electric field and the Lorentz force law, respectively. For the proton to be "undeflected," they must cancel out--so set them equal to each other and see what happens. Once you find the proton trajectory's radius, parts 3 and 4 become trivial, as long as you remember the relationship between the period and frequency. Part (5) is just an application of a formula you don't seem to have remembered--the formula for the electric field in the interior of a parallel-plate capacitor. You can either look it up or derive it using Gauss's Law. [/QUOTE]
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Introductory Physics Homework Help
Solving Two Charged Plates Homework: Magnetism, Frequency & Charge Density
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