Phys.219-Lec03-2011

Phys.219-Lec03-2011 - Lecture 3-1 Physics 219 Question 1...

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Lecture 3-1 Physics 219 – Question 1 – Jan. 20, 2010 Three point charges are arranged at the corners of a square as shown. What is the direction of the electric field at the remaining corner? (Take Q > 0.) a) toward the lower right b) toward the upper left c) upward d) to the right e) none of the above - Q Q Q
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Lecture 3-2 Electric Dipoles • Water molecule can be thought of as consisting of 2 standard dipoles at an angle to each other. Net neutral molecules can have electrical dipole moments Permanent dipole moment (polar) vs. induced dipole moment • Typical dipole consists of positive and negative charges slightly displaced.
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Lecture 3-3 Electric Potential Energy It’s energy! So scalar measured in J (Joules) . Work W field only depends on end points and not on the path . • Electric potential energy is the energy ‘stored’ in (static) E field. • If E does work W field in moving a charge, the potential energy decreases by W field , or U = -W field .
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Lecture 3-4 Electric Potential Energy : Examples E field U W qEd ∆= = d q G U mgh r q 2 q 1 choose a reference point where
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Phys.219-Lec03-2011 - Lecture 3-1 Physics 219 Question 1...

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