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An electric field line at any point is drawn so that

  • A.it crosses other field lines at right angles
  • B.it is tangent to the field direction there
  • C.it is perpendicular to the field direction there
  • D.its length is proportional to the field magnitude there

Answer: B

Field lines cannot cross, since the field has one direction at each point, and their density conveys the magnitude. They begin on positive charge and end on negative charge, or run to infinity, which is the picture Gauss's law makes quantitative.

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