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Coaxial cables are widely used with audio-visual technology, electronic instrumentation, and radio broadcasting, because they minimize interference with or from signals traveling on the cable. Coaxial cables consist of a wire inner conductor surrounded by a thin cylindrical
FIGURE 21.39 A coaxial cable (Passage Problems 76-79)
79. A coaxial cable in electrostatic equilibrium carries charge –Q on its inner conductor and +Q on its shield. If the charge on the shield only is doubled.
- a. the magnitude of the electric field between the conductors will double.
- b. the magnitude of the electric field outside the shield will double.
- c. the magnitude of the electric field at the outer surface of the shield will become twice the magnitude of the field at the shield's inner surface.
- d. the magnitude of the electric field at the outer surface of the shield will equal the magnitude of the field at the shield's inner surface.
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