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Two separate but nearby coils are mounted along the same axis. A power supply controls the flow of current in the first coil, and thus the magnetic field it produces. The second coil is connected only to an ammeter. The ammeter will indicate that a current is flowing in the second coil:.

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The ammeter will indicate that a current is flowing in the second coil only when current changes in the first coil.

Induced emf

An emf is induced in a coil placed in a magnetic field when a current carrying conductor moves in the field.

emf = NdФ/dt

where;

  • dФ is change in flux of the field
  • N is number of turns
  • dt is change in time

Thus, the ammeter will indicate that a current is flowing in the second coil only when current changes in the first coil.

Learn more about induced emf here: https://brainly.com/question/13744192

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