81. The solenoid of diameter 10 cm and length 60 cm has 1000 turns. Amperage therein uniformly increases to 0.2 A for 1 s. In the wearing ring coil of copper wire having a sectional area of 2 mm2. Find the induction current arising in the ring.

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