p240_ct3_w12_jan_12 - Physics 240 Winter 2012 Lecture #3 My...

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Physics 240 Winter 2012 Lecture #3 Dr. Dave Winn 2405 Randall Lab winn@umich.edu My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm (Prof. Gidley)
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The illustration shows the electric field lines due to three point charges. The electric field is strongest A. where the field lines are closest together. B. where the field lines are farthest apart. C. where adjacent field lines are parallel. D. none of the above Q21.8
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A positively charged particle is placed at rest on one of the electric field lines in the diagram below and then released. Which of the following statements most accurately describes its motion? A)Its acceleration will always be tangent to a field line B)It will move along the field line at a non-constant velocity C)It will accelerate perpendicular to the field lines D)It will move at a constant velocity along the field lines. E)It will move perpendicular to the field lines at a constant velocity.
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“Spooky action- at-a-distance”: Einstein • Two charges interact across empty space according to Coulomb‟s law: F=(kQ 1 Q 2 /r 12 2 ) – How does Q 1 „know‟ that Q 2 is there? – What happens if I suddenly remove Q 2 ? – Non-local interaction? • Problem is the same for gravity, and has troubled physicists since Newton… • How does the Earth reach out and grab the moon? Q 1 Q 2 For more spooky physics, see: http://www.ns.umich.edu/htdocs/releases/story.php?id=6016
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Electric fields Michael Faraday began to think something was there around each charge… Even if only one charge is around, some field , a region of influence, surrounds it. This is something
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p240_ct3_w12_jan_12 - Physics 240 Winter 2012 Lecture #3 My...

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