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Two coils carrying current attract or repel according to

  • A.whether their currents circulate in the same or opposite senses
  • B.the ratio of their diameters
  • C.whether they are air-cored or iron-cored
  • D.the frequency at which they are supplied

Answer: A

Coaxial coils with currents in the same sense behave as two magnets with unlike poles facing and attract; reversing one reverses the force. This is the principle of the electrodynamometer movement and of the current balance formerly used to realise the ampere.

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