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Lecture+03+jan12

# Lecture+03+jan12 - E&M Survey coming No discussion class...

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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 E&M Survey coming No discussion class Monday Harmonic oscillator-spring eq.

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Visualizing a vector field? See the Davidson applet with all the vectors/arrows
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! MP#3 problem 1 has nice applet Note: Dipole
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. When the spacing of field lines becomes infinitesimally small then E→ ∞ D. A dipole (+ and – charge of same magnitude) has some lines going to and coming in from ∞ E. In a region of uniform E field the line spacing is constant

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