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PPE02_Coulombs_Law - Electric Fields Coulomb's Law RHJansen...

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Electric Fields Electric Fields Coulomb’s Law Coulomb’s Law © RHJansen
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Coulomb’s Law and the Force of Electricity Electricity is a field force similar to gravity. The equations follow the same patterns and they are worth comparing in order to reinforce each other. Newton’s Law of Universal Gravitation Coulomb’s Law F g = - G m 1 m 2 r 2 F E = k q 1 q 2 r 2 G = 6.67 10 - 11 k = 9 10 9 © RHJansen
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Coulomb’s Law and the Force of Electricity This version of Coulomb’s Law and the constant k are used in most situations in this course. The formal variant of the formula has certain advantages. Where the constant is the permittivity of free space F E = k q 1 q 2 r 2 k = 9 10 9 © RHJansen k = 1 4 π 0 = 1 4 π 8.85 10 -12 ( 29 = 9 10 9 F E = 1 4 π 0 θ 1 θ 2 ρ 2 0 = 8.85 10 -12
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Example 1 Determine the force of gravity and the force of electricity between a +1.0 C charge with a mass of 1.0 × 10 −8 kg and −1.0 C charge with a mass of 5.7 × 10 −12 kg separated by 1 m .
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