Eddy currents are also known as Facault’ s current.
Self-Induction
The phenomena of production of induced emf in a circuit due to change in current flowing in its own, is called self induction.
Coefficient of Self-Induction
The magnetic flux linked with a coil φ = LI where, L = = coefficient of self induction. The induced emf in the coil E = – L dl / dt
it unit of self induction is henry( H) and its dimensional formula is [ ML 2 T-2 A-
2 ]. Self – inductance of a long solenoid is given by normal text
L = μ o N 2 A / l = μ o n 2 Al where. N = total number of turns in the solenoid, 1 = length of the coil, n = number of turns in the coil and A = area of cross-section of the coil. If core of the solenoid is of any other magnetic material, then L = μ o μ r N 2 A / l Self – inductance of a toroid L = μ o N 2 A / 2πr Where, r = radius of the toroid Energy stored in an inductor E = 1 / 2 LI 2
Mutual Induction
The phenomena of production of induced emf in a circuit due to the change in magnetic flux in its neighbouring circuit, is called mutual induction.
Coefficient of Mutual Induction