04/10/2026 KEDARNATH Y -SR. GR. LECTURER
GPT KALABURAGI
1
Self-Induced EMF
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Physics electrical and electronics department
Typology: Study notes
2025/2026
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04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Self-Induced EMF
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Self-Induced EMF
When the current flowing through a coil changes, the
magnetic flux linked with the same coil also changes.
This change of flux induces an emf in the same coil
which always opposes the change in current (as per
Lenz’s law).
● When current flows through a coil, it creates a
magnetic field around it.
● If the current changes (increases or decreases), the
magnetic field also changes.
● This changing magnetic field induces an EMF in the
same coil.
● According to Lenz's Law, the induced EMF
opposes the change in current that produced it.
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Mutually Induced EMF
When the current in one coil (called the primary coil)
changes, the magnetic flux produced by it links with a
nearby coil (called the secondary coil). The change of
flux induces an emf in the other coil. This emf is called
mutually induced emf.
Explanation:
● When current in the first coil changes, its magnetic
field changes.
● This changing magnetic field links with the second
coil.
● As a result, an EMF is induced in the second coil.
● This principle is used in Transformer.
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Mutually Induced EMF
Example:
• The operation of a transformer relies
on mutual induction, where the
primary coil's changing current
induces an EMF in the secondary coil
to transfer energy wirelessly or at a
different voltage level.
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Self-Inductance
Self-inductance is the property of a coil (or
circuit) by which it opposes any change in
the current flowing through it by inducing
an emf in the same coil.
Explanation: When the current in a coil
changes, the magnetic flux linked with the
coil also changes. This changing flux
induces an emf in the coil itself. This
induced emf is always in a direction to
oppose the change in current (Lenz’s law).
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Self-Inductance
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Define Mutual inductance
04/10/2026 KEDARNATH Y -SR. GR. LECTURER
Coefficient of Mutual Inductance
- (^) Definition: The coefficient of mutual inductance between two coils is equal to the emf induced in one coil when the rate of change of current in the other coil is 1 ampere per second.