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Unformatted text preview: howard (cah3459) – oldhomework 04 – Turner – (56705) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points P . x y ++++ ++++ L . x y +++++ +++++ + + + + +----- M . x y + + + + + + + + + + + +------ G . x y + + + +---- S . x y---- ++++ For which configuration(s) does the total electric field vector at the origin have non- zero components in the x direction as well as the y direction ( i.e. , both x and y components are non-zero)? 1. Configurations P and M only 2. Configuration G only 3. Configurations G and M only 4. Configuration S only correct 5. Configurations G , S and M only 6. Configurations G and P only 7. Configuration L only 8. Configurations G , P and M only 9. Configuration P only 10. Configurations P , L and M only Explanation: Basic Concepts: Δ E = k Δ q r 2 ˆ r and E = Δ E . Symmetry of the configuration will cause some component of the electric field to be zero. Solution: Configuration G : It is anti- symmetric about the y-axis (opposite sign of charges), so the electric field has no y- component. x y + + + +---- G Configuration P : It is symmetric by a ro- tation of 180 ◦ , so the electric fields generated by these two pieces have opposite directions; therefore the total field is zero. howard (cah3459) – oldhomework 04 – Turner – (56705) 2 x y ++++...
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This note was uploaded on 09/15/2010 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas.
- Fall '08