Lecture 07 - Electric field lines. Electric dipole

# Lecture 07 - Electric field lines. Electric dipole - The...

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1 Lecture 7 Electric field lines. The electric dipole. The fluid analogy A very helpful way to visualize and draw electric field lines: You can imagine some kind of fluid coming out of positive charges and being sucked in by negative charges . The field lines would be the path of this fluid field lines would be the path of this fluid. Example: The dipole http://falstad.com/mathphysics.html Electric field lines for several two charge systems + + Q All lines coming out of the charges. Twice as many lines on + + the right. 2 + 2 Twice as many lines and coming in on the right. ACT: E-field lines A. Q 1 =+ q ; 2 =+ q B. Q 1 =+2 ; 2 =+ C. Q 1 =+ ; 2 =- 1 2 Which of the following choices would generate the electric field lines shown below? D. Q 1 =+2 ; 2 =- E. Q 1 =-2 ; 2 =+ Lines into 2 2 < 0 # lines in 1 = 2 (# lines in 2 ) | 1 |~2| 2 | Lines out of 1 1 > 0 Not a dipole.

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2 Example: The electric dipole + d + Q p G - -Q Definition: Electric dipole moment Qd = G G Direction: From – to + What happens to a dipole in an external electric field?
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Lecture 07 - Electric field lines. Electric dipole - The...

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