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The force per unit length between two long parallel conductors is proportional to

  • A.the product of the currents divided by the square of their separation
  • B.the sum of the currents divided by their separation
  • C.the product of the currents multiplied by their separation
  • D.the product of the currents divided by their separation

Answer: D

The field of one falls as the inverse first power of distance and the force on the other is proportional to that field, so the force per unit length does too. A short-circuit current of tens of kiloamperes therefore produces forces on busbars that the mechanical design must withstand.

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