Lecture 3 jan10 - Lecture 3 Electric field lines and...

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Lecture 3 Electric field lines and electric di poles* * We have already talked about the electric mono pole ---the point charge Qwizdom session ID=240 (all term)
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Visualizing a vector field? Remember the Davidson applet with all the vectors/arrows?
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Electric Field Lines (Faraday’s Lines of Force) (helpful visualizer of ) E Electric Field lines are drawn such that: 1. at any point is tangent to the line 2. Lines begin on + charge (or ∞), end on - (or ∞) 3. E is large where the lines are closely spaced (lines per area perpendicular E) 4. Field maps are not contours of constant E!! E
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Examples of Field Lines Real life Demo! Play with RPI applet on ctools/resources MP#3 problem 1 has nice applet Note: Dipole
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Question #1 Which statement about field lines is FALSE? A. Field lines never cross each other B. An isolated – pt. charge has lines coming in from ∞ C. A dipole (+ and – charge of same magnitude) has some lines going to and coming in from ∞ D. When the spacing of field lines becomes infinitesimally small then E→ ∞ E. In a region of uniform E field the line spacing is constant
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Lecture 3 jan10 - Lecture 3 Electric field lines and...

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