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Published byMargaretMargaret Horton Modified over 9 years ago
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Exam Date – Wed 2/9 Topics Covered Listed on Class Website Sample Exam from a few years back is also on the web. Today Start Unit 5: Electric Potential (Energy Methods) Wednesday Monday More of the same Friday: Surprise – Quiz #2 (for real!)
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Spring Break is just a few weeks away – (5ish)
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The figure shows the electric field lines in the vicinity of two point charges. Which one of the following statements concerning this situation is true? A) q 1 is negative and q 2 is positive. B) The magnitude of the ratio (q 2 / q 1 ) is less than one. C) Both q 1 and q 2 have the same sign of charge. D) The magnitude of the electric field is the same everywhere. E) The electric field is strongest midway between the charges.
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A cubical Gaussian surface is placed in a uniform electric field as shown in the figure. The length of each edge of the cube is 1.0 m. The uniform electric field has a magnitude of 5.0 × 10 8 N/C and passes through the left and right sides of the cube perpendicular to the surface. What is the total electric flux leaving the cubical Gaussian surface? A) 5.0 × 10 8 m 2 /C B) 3.0 × 10 9 N × m 2 /C C) 2.5 × 10 6 N × m 2 /C D) 1.5 × 10 7 N × m 2 /C E) zero N × m 2 /C
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What is the electric flux passing leaving a Gaussian surface that surrounds a +0.075 C point charge? A) 8.5 × 10 9 N × m 2 /C B) 6.8 × 10 8 N × m 2 /C C) 1.3 × 10 7 N × m 2 /C D) 4.9 × 10 6 N × m 2 /C E) 7.2 × 10 5 N × m 2 /C 0 = 8.85×10 −12 SI Units
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A solid, conducting sphere of radius a carries an excess charge of +6 µ C. This sphere is located at the center of a hollow, conducting sphere with an inner radius of b and an outer radius of c as shown. The hollow sphere also carries a total excess charge of +6 µ C. Determine the excess charge on the outer surface of the outer sphere (a distance c from the center of the system). A) zero coulombs B) – 6 C C) +6 C D) +12 C E) – 12 C
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+ Mrs. Field Mr. External
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Mrs. Field Mr. External
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E + charge Mr. ExternalMrs. Fields That was HARD WORK Mr. External Sure Was Mrs. Field Each does the negative amount of work that the other one does. Constant Speed
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The net work done by a conservative (field) force on a particle moving around a closed path is ZERO!
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The work necessary for an external agent to move a charge from an initial point to a final point is INDEPENDENT OF THE PATH CHOSEN!
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A conservative force is NOT a Republican. An External Agent is NOT 007.
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