oldhomework 04-solutions

oldhomework 04-solutions - howard(cah3459 oldhomework 04...

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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 – fnd all choices beFore answering. 001 10.0 points P . x y ++++ L . x y +++++ + + + + + - - - - - M . x y ++++++ ------ G . x y ---- S . x y ±or which confguration(s) does the total electric feld 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. Confgurations P and M only 2. Confguration G only 3. Confgurations G and M only 4. Confguration S only correct 5. Confgurations G , S and M only 6. Confgurations G and P only 7. Confguration L only 8. Confgurations G , P and M only 9. Confguration P only 10. Confgurations P , L and M only Explanation: Basic Concepts: Δ E = k Δ q r 2 ˆ r and E = ± Δ E . Symmetry oF the confguration will cause some component oF the electric feld to be zero. Solution: Confguration G : It is anti- symmetric about the y -axis (opposite sign oF charges), so the electric feld has no y - component. x y G Confguration P : It is symmetric by a ro- tation oF 180 , so the electric felds generated by these two pieces have opposite directions; thereFore the total feld is zero.
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howard (cah3459) – oldhomework 04 – Turner – (56705) 2 x y ++++ P Confguration S : It is anti-symmetric by rotation oF a 180 , so the total feld has non- zero components in both x and y directions,
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oldhomework 04-solutions - howard(cah3459 oldhomework 04...

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