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The Biot-Savart law gives the contribution of a current element to the

  • A.magnetic field intensity at a point
  • B.force on a second current element nearby
  • C.electric field intensity produced by the moving charge
  • D.flux linking a circuit surrounding the element

Answer: A

The contribution falls as the inverse square of the distance and is directed at right angles to both the element and the line joining it to the point. It plays for magnetostatics the part Coulomb's law plays for electrostatics.

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