Question

How does self-inductance create back emf?

Answer 1

. This change curling electric field How does self-inductance create back emf ? Answer. When a current starts to flow through a coil, the magnetic flux of coil changes in magnetic flux induces a according to Faraday's low. This electric field induces an emf on the coil in a direction opposite to the cause that cause a Changing magnetic flux. The Changing magnetic flux is incvese in Current. So the induced emf opposes this applied field emf to produce current. This is cause of negative Sign of back emf. we can understand by example of solenold -- The field inside solenoid is given by - B = Mon I Mo NI l Capturing flux is Ø = NBA when it comes to flux, then gives us emf , accto Faraday's law E = do dt A solenoid with it will current through changing genrate Changing magnetic field: dB di dt dt A Captured field is called flux and a flux changing genrates an emf called back emf. Es at NMONDI

The Seif induced emf in a circuit is directly proportional to the time rate of change of Current (d) multiplied by constant L. i.e. Self Inductance (2), is the ratio of the back emf (&) to the time rate of change of Current producing it.