The figure shows hysteresis curves for three different materials. A hysteresis curve is a plot of the

Question:

The figure shows hysteresis curves for three different materials. A hysteresis curve is a plot of the magnetic field strength inside the material (B) as a function of the externally applied field (B0).
(a) Which material would make the best permanent magnet? Explain.
(b) Which would make the best core for an electromagnet? Explain.