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Choosing cylindrical rather than Cartesian coordinates for a coaxial cable problem is worthwhile because

  • A.the unit vectors of the cylindrical system are constant vectors
  • B.the divergence takes a simpler form in cylindrical coordinates generally
  • C.Cartesian coordinates cannot represent a field with circular symmetry
  • D.the field depends on one variable only in that system

Answer: D

The radial field of a coaxial cable is a function of the radial distance alone, so a three-dimensional problem becomes one-dimensional. In Cartesian coordinates the same field would depend on both x and y in an awkward way.

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