12. Solenoid 2 m long, consisting of 1000 turns, the cross-sectional area of 8 cm2 in the circuit where the current intensity is changed to 20 A for 0.1 second. Define self-induction EMF in the solenoid is excited when it is inserted into the iron core with a permeability of 500.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)