EES 0836 Lecture Notes - Lecture 33: Test Particle, Proton Conductor, Electric Field
3 Apr 2016
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Lecture - 33: analogy to gravity field, on the surface of the earth, the force due to gravity is f = mg, where g is the gravitational acceleration. Tells masses how to move (how much force on mass, m: since we know gravity is f = gmm/r2, g = gm/r2. Acceleration due to gravity is independent of the mass of the test body : electric force is f = kqq/r2, electric field is just e = kq/r2 so that f = qe. Q is the charge analog to mass. E is the analog to gravitational acceleration: tells how a test charge , q, will respond (what"s the force on it?) Units of e work out to volts per meter (v/m: example electric fields around charges, but realistic picture folds in strength, previous pictures conveyed direction, but did not account for 1/r2 strength of the. E-field: the e-field gets weaker as one goes farther away from a charge.
