lecture07 - September 13, 2011 Physics for Scientists &...

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September 13, 2011 Physics for Scientists & Engineers 2, Chapter 22 1
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September 13, 2011 Physics for Scientists & Engineers 2, Chapter 22 2 Special Symmetries
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September 13, 2011 Physics for Scientists&Engineers 2 3 Shown is an arrangement of ±ve charged pieces of plastic and an electrically neutral coin (q 1 =q 4 =3nC, q 2 =q 5 =-5.9nC and q 3 =-3.1nC). A Gaussian surface S is indicated. What is the net electric ²ux through the surface? Gauss Clicker Hint: Use Gauss’ Law A: Φ=-6 10 -9 C/ε 0 = -678 Nm 2 /C B: Φ=-12 10 -9 C/ε 0 = -1356 Nm 2 /C C: Φ=0 D: Φ= 2.9 10 -9 C/ε 0 = 328 Nm 2 /C
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September 13, 2011 Physics for Scientists & Engineers 2, Chapter 22 5 Clicker Quiz We start with a hollow, conducting sphere that is initially uncharged. We place a positive charge + q 1 inside the sphere as shown. We then place a second positive charge + q 2 near the sphere but outside of the sphere. Which of the following describes the net electric force on each charge? A. ere is a net electric force on + q 2 but not on + q 1 B. ere is a net electric force on + q 1 but not on + q 2 C. Both charges feel a net electric force with the same magnitude and in the same direction. D. Both charges feel a net electric force with the same magnitude but in the opposite direction. E. ere is no net electric force on either charge. e net force on + q 1 is zero because of Gauss’s Law e net force on + q 2 is not zero because of polarization
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Physics for Scientists & Engineers 2, Chapter 22 6 Cylindrical Symmetry
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lecture07 - September 13, 2011 Physics for Scientists &...

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