The figure below shows a cross section of an "infinitely" long solenoid (circle) that has n=23000 turns/m; the axis of the solenoid (a bold dot) is perpendicular to the plane of cross section. The radius of the solenoid, r=72 cm. A square frame with a side a=3 cm is located in the plane of cross section. The current in the solenoid is I=6.32 A. The rate of change of the current in the solenoid is ΔI/Δt=1.024 A/s and the resistance of the frame is R=25 Ω. Find the instantaneous value of the magnetic field inside the solenoid: B=  T. Find the absolute value of induced e.m.f. in the frame: ℰind=  V. Find the absolute value of induced current in the frame: Iind=  A.

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Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.