# lecture2 - 1 Electric Field • Coulomb’s Law •...

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Unformatted text preview: 1 Electric Field • Coulomb’s Law • Electric Field Text sections 23.3, 23.4 Practice: Chapter 23 , problems 4, 7, 11, 13, 15 Coulomb’s Law Point charges exert forces on each other: 2 1 q q , r r 1 q 2 q r ˆ r F ˆ 2 2 1 r q q k e = 2 2 9 10 988 8 C m N x k e • = . (Coulomb’s Law constant) r ˆ is a unit vector parallel to r F- F 2 Exercise: L L ° 30 ° 30 m m q q GIVEN : •Identical Masses, m=1.0 gram •Equal charges q •L= 60 cm FIND : q (equilibrium) (How big is a coulomb?) Quiz L L ° 30 ° 30 m m q q The tension in each string is A) mg B) mg cos 30 ° C) mg/ cos 30 ° D) mg tan 30 ° E) None of the above; it depends on the charge. (equilibrium) 3 Quiz: L L m m 2q q/2 What happens to each angle if the charge on the left is doubled, and the other one is halved? (equilibrium) θ 1 ? θ 2 ? A) Both increase B) both decrease C) θ 1 increases, θ 2 decreases D) θ 1 decreases, θ 2 increases E) both stay the same Example Example : Find: Force (vector) on q 3 , in Cartesian form....
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lecture2 - 1 Electric Field • Coulomb’s Law •...

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