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Ch15_2 - Ch 15 Electrostatics Part 2 PHY213 Lecture 2...

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Ch. 15 Electrostatics, Part 2 PHY213, Lecture 2 1 Electrical Forces are Field Forces square6 This is the second example of a field force square6 Gravity was the first square6 Remember, with a field force, the force is exerted by one object on another object even though there is no physical contact between them square6 There are some important similarities and differences between electrical and gravitational forces Electrical Force Compared to Gravitational Force square6 Both are inverse square laws square6 The mathematical form of both laws is the same square6 Masses replaced by charges square6 Electrical forces can be either attractive or repulsive square6 Gravitational forces are always attractive square6 Electrostatic force is stronger than the gravitational force The Superposition Principle square6 The resultant force on any one charge equals the vector sum of the forces exerted by the other individual charges that are present. square6 Remember to add the forces as vectors Superposition Principle Example square6 The force exerted by q 1 on q 3 is square6 The force exerted by q 2 on q 3 is square6 The total force exerted on q 3 is the vector sum of and 13 F r 13 F r 23 F r 23 F r
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Ch. 15 Electrostatics, Part 2 PHY213, Lecture 2 2 Electrical Field square6 Maxwell developed an approach to discussing fields square6 An electric field is said to exist in the region of space around a charged object square6 When another charged object enters this electric field, the field exerts a force on the second charged object Electric Field, cont.
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