Explain self induction and mutual induction
Answers
The changing magnetic field created by one circuit (the primary) can induce a changing voltage and/or current in a second circuit (the secondary).
The mutual inductance, M, of two circuits describes the size of the voltage in the secondary induced by changes in the current of the primary:
change in I (primary)
V(secondary) = - M * ----------------------
change in time
The units of mutual inductance are henry, abbreviated "H".
A circuit can create changing magnetic flux through itself, which can induce an opposing voltage in itself. The size of that opposing voltage
MUTUAL INDUCTION- consider two coils of wire kept side by side. When the strength or direction of the current in one coil changes the magnetic flux around it changes. As a result an emf is induced in the secondary coil . This phenomenon is the mutual induction.
SELF INDUCTION- The change in the magnetic flux due to the flow of an AC in a solenoid will generate a back emf in a direction opposite to that applied to it. This phenomenon is known as self induction .