EE204B_Lesson_06_ELectrostatic_Fields-1_

Also the constant k is equal to 140 where 0885x10 12

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Unformatted text preview: so, the constant k is equal to 1/4πε0, where ε0=8.85x10-12 C2/N·m2. One could write Coulomb’s Law like this… r q1q2 F12 = k 2 , r12 attractive for unlike To make this into a “really good” starting equation I should specify “repulsive for like,” but that makes it too wordy. You’ll just have to remember how to find the direction. Remember, a vector has a magnitude and a direction. di EE204B Electromagnetics Prof. Yong H. Won Spring 2010 6 Lesson 06 The equation is valid for point charges. If the charged objects are spherical and the charge is uniformly distributed and the charge is uniformly distributed, r12 is the distance between the the distance between the centers of the spheres. r12 + - If more than one charge is involved, the net force is the vector sum of all forces (superposition). For objects with complex shapes, you must add up all the forces acting on each separate charge (turns into calculus!). + + + - - - EE204B Electromagnetics Prof. Yong H. Won Spring 2010 7 Lesson 06 We could have agreed that in the formula for F, the symbols q1 and q2 stand for the magnitudes of the ch...
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This note was uploaded on 05/14/2010 for the course EE EE204 taught by Professor Parkkyungsoo during the Spring '10 term at Korea University.

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