When current flow in a coil causes an emf to be induced in itself, it is known as ______.

When current flow in a coil causes an emf to be induced in itself, it is known as ______.

• A. Self induction
• B. Mutual induction
• C. Inductance
• D. Flux

Answer: (A)

Self-induction is when a current flowing in a coil changes and that changing current alters the magnetic flux through the coil, inducing an emf in the same coil. This happens because a changing magnetic flux links with the coil, and Faraday’s law says emf = -dΦ/dt. In a practical view, the emf is proportional to how quickly the current changes, described by emf = -L di/dt, where L is the coil’s inductance. The negative sign, per Lenz’s law, means the induced emf opposes the change in current. This is different from mutual induction, where a changing current in one coil induces emf in a different coil. Inductance is the property of the coil that relates current to its magnetic flux linkage, and flux is the magnetic flux itself.

Self-induction is when a current flowing in a coil changes and that changing current alters the magnetic flux through the coil, inducing an emf in the same coil. This happens because a changing magnetic flux links with the coil, and Faraday’s law says emf = -dΦ/dt. In a practical view, the emf is proportional to how quickly the current changes, described by emf = -L di/dt, where L is the coil’s inductance. The negative sign, per Lenz’s law, means the induced emf opposes the change in current. This is different from mutual induction, where a changing current in one coil induces emf in a different coil. Inductance is the property of the coil that relates current to its magnetic flux linkage, and flux is the magnetic flux itself.