L02_viet_Electric Field

L02_viet_Electric Field - Physics 122 Electricity and...

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Physics 122 Electricity and Magnetism Lecture 2 Electric Field
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05/07/09 Physics 122 - Lecture 2 2 Motion and Response Question: If charge A moves, how long does it take for the force vector on B to respond by changing direction?
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05/07/09 Physics 122 - Lecture 2 3 Isaac Newton vs. Michael Faraday Isaac Newton: Forces like gravity and electricity are examples of action at a distance . The “influence” of A reaches across space to affect B instantly and without the need for contact. Michael Faraday: Forces like gravity and electricity are mediated by a “field” that alters the space around the mass or charge. Particle A produces a field, and particle B responds to this field by experiencing a force. Changes in the field require time to propagate.
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05/07/09 Physics 122 - Lecture 2 4 Example : The Gravitational Field (1) 1 2 1 on 2 2 on 1 2 m m F F G r = = 1 2 1 on 2 2 1 2 2 2 mass 1 , toward mass 1 , toward mass 1 m m F G r m m G r m g = = = r r
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Physics 122 - Lecture 2 5 Example : The Gravitational Field (2) on m ˆ ˆ F mg j g g j m m - = = = - r r (1) The field strength g is proportional to the mass. g~m 1 . Larger masses create stronger gravitational fields. (2) The field strength is
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This note was uploaded on 04/25/2009 for the course ECE PHYS122 taught by Professor Viet during the Spring '09 term at 東京大学.

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L02_viet_Electric Field - Physics 122 Electricity and...

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