675_Physics ProblemsTechnical Physics

675_Physics ProblemsTechnical Physics - Chapter 23 e jb g e...

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Chapter 23 15 (iii) Q == × × = × −− λ A 80 0 10 64 0 030 0 1 54 10 12 10 .. . Cm m C ej bg (iv) Q × × = × A 80 0 10 40 0 030 0 0 960 10 12 10 . m C Section 23.6 Electric Field Lines P23.38 FIG. P23.38 P23.39 FIG. P23.39 P23.40 (a) q q 1 2 6 18 1 3 = =− (b) qq 12 is negative, is positive P23.41 (a) The electric field has the general appearance shown. It is zero at the center , where (by symmetry) one can see that the three charges individually produce fields that cancel out. In addition to the center of the triangle, the electric field lines in the second figure to the right indicate three other points near the middle of each leg of the triangle where E = 0 , but they are more difficult to find mathematically.
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