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Unformatted text preview: klarin (sjk772) 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 M . x y ++++ ++++ P . x y + + + + + + + + + + + + G . x y + + + + S . x y +++++ +++++ + + + + + L . 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 M and P only 2. Configurations M , S and P only 3. Configuration M only 4. Configurations G , L and P only 5. Configurations G and P only 6. Configuration S only 7. Configurations G , M and P only 8. Configurations G and M only 9. Configuration L only correct 10. Configuration G only Explanation: Basic Concepts: E = k q r 2 r and E = summationdisplay 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 M : 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. klarin (sjk772) oldhomework 04 Turner (56705) 2 x y ++++ ++++ M Configuration L : It is anti-symmetric by rotation of a 180...
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- Fall '10