Ch. 20 Homework, Phy 132, Spring 1998, Tulane

Note: ^ denotes power, eg. x^2 = x*x, i.e. x squared 
20.1   (a) 0.024 J    (b) -0.024 J    (c) -8000 V    (d) -2000 x
       (e) 4000 - 2000 x    (f) 2000 - 2000 x

20.6   (a) 25.4 kV    (b) 12.7 kV    (c) 0

20.7   (a) 12.9 kV    (b) 7.55 kV    (c) 4.44 kV

20.11  (a) 0.049 J    (b) 0 J    (c) -0.023 J    (d) -0.013 J

20.18  (a) V = 2kq/sqrt(x^2+a^2)    (b) 2kqx / [sqrt(x^2+a^2)]^3

20.21  (a) -3000 V/m    (b) -3000 V/m    (c) 3000 V/m    (d) 0

20.23  0.506 mm

20.39  (a) 30000 eV    (b) 4.8 * 10^-15 J    (c) 10^8 m/s

20.42  (a) 0, since electric field is zero outside
       (b) kQ(1/a - 1/b)

20.60  (a) ke^2/2r    (b) 13.6 eV
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