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 s This is the second example of a field force s Gravity was the first s Remember, with a field force, the force is exerted by one object on another object even though there is no physical contact between them s There are some important similarities and differences between electrical and gravitational forces Electrical Force Compared to Gravitational Force s Both are inverse square laws s The mathematical form of both laws is the same s Masses replaced by charges s Electrical forces can be either attractive or repulsive s Gravitational forces are always attractive s Electrostatic force is stronger than the gravitational force The Superposition Principle s The resultant force on any one charge equals the vector sum of the forces exerted by the other individual charges that are present. s Remember to add the forces as vectors Superposition Principle Example s The force exerted by q 1 on q 3 is s The force exerted by q 2 on q 3 is s 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 s Maxwell developed an approach to discussing fields s An electric field is said to exist in the region of space around a charged object s When another charged object enters this electric field, the field exerts a force on the second charged object Electric Field, cont. s
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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

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