15. The coil of copper wire (ρ = 16 m • NOM) has a length l = 25 cm, diameter D = 3,0 cm and contains N = 100 turns. Cross-sectional area s = 1,5 mm2. The coil is connected to a source of EMF. After a time t after switching off the source of EMF and short-circuiting the coil current is reduced three times in its chain?

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