Recall Coulomb’s Law Force between charges q 1 and q 2 separated distance r: 1 2 2 G L9 H109 0 I2/2 “Coulomb constant” Opposite charges attract, like charges repel Physics 102: Lecture 2, Slide 2
Figure 2 3 1 A system of three charges Solution: Using the superposition principle, the force on q3 is 13 23 31323 2213 23 013 23 1 ˆˆ 4 qq qq ?? rr FFF r r GGG In this case the second term will have a negative coefficient, since is negative
11 1 1 NOT MUCH ‘WORK’ IN SPITE OF WORKING HARD Kamali is preparing for examinations She spends lot of time in studies She r eads books, draws diagrams, organises her thoughts, collects question papers, attends classes, discusses problems with her friends, and performs experiments She expends a lot of energy on these activities In common
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