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lecture2(2)

# lecture2(2) - L ecture 2 C oulombs Law I ntroduction to...

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Lecture 2: Coulomb’s Law Introduction to Electric Fields

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The course will be curved with a median near a B/B- If the class does exceptionally well, then the median may go up. There will be 3 exams 2 nd -4 th Thursday Lowest score will be dropped 45% of your grade The Final Cumulative 40% of your grade Clicker questions None today Tomorrow there will be Worst 3 days dropped 15% of your grade Each lecture gets equal weight August 5, 2013 2 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
You’ll be expected to use calculus in this course Derivatives Integrals Maximization problems You will also need to use vectors Dot products Cross products There is a math homework on TED. Please do the problems this week. August 5, 2013 3 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer

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Physics Concept Components Learning Outcome Electric Force and Fields Charge and its analogy to mass Coulomb’s Law and its analogy to gravity Electric Fields Electric Flux Gauss’s Law Electric Potential Capacitance Material Properties Evaluate the forces of charged objects on one another. Evaluate value and magnitude of electric fields at arbitrary points in space. Evaluate the potential differences between objects (surfaces and points). Discern between electric potential and electric potential energy Compute electric field and potential for point charges Compute electric field and potential from charge distributions August 5, 2013 4 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
August 5, 2013 5 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer k e =8.99x10 9 N*m 2 /C 2 + + + F E , on 1 due to 2 = k e q 1 q 2 r 2 ˆ r q 1 q 2 r ˆ r

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Define a coordinate system Make a clear diagram of the situation List the known quantities Recall the concept that you are trying to evaluate In this case, like-signed charged objects repel/ opposite-signed charged objects attract by the magnitude in Coulomb’s Law. August 5, 2013 6 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer
Before we can do that we need to remember how to deal with multiple forces We can use superposition of forces. Calculate separately Add components Determine magnitude and direction as necessary to complete the problem August 5, 2013 7 Physics 2B -­‐ Summer Session 2 -­‐ C. Palmer F Total = F 1 + F 2 + ...

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There are three charges with the following specifications: Charge A: +6.0 µ C (2.0 cm, -1.0 cm) Charge B: -4.0 µ C (-2.0 cm, 2.0 cm) Charge C: -2.0 µ C (2.0 cm, 2.0 cm) What is the electric force on charge C? Please draw this picture August 5, 2013 8 Physics 1B -­‐ Summer Session 1 -­‐ C. Palmer +x +y B A C
August 5, 2013 9 Physics 1B -­‐ Summer Session 1 -­‐ C. Palmer Electric force directions Which of the following is the electric force diagram for the electric forces on C from charges A and B?

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