To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. Hard materials have high coercivity, whereas soft materials have low coercivity.aterials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare earth metals, and some naturally occurring minerals such as lodestone.
Atahualpa was the last Inca ruler, executed by Spanish conquistador Francisco Pizarro in 1533, marking the end of the Inca empire.orn c. 1502, Atahualpa was the younger son of Inca ruler Huayna Capac. At Huayna's death, the kingdom was divided between his sons. This lead to a bloody civil war, which Atahualpa won in 1532.
Pizarro himself captured Atahualpa Inca. Fearing for his life, Atahualpa told Pizarro if he would spare him, within two months his people would fill a room 24-feet long by 18-feet wide and a height of 8-feet with gold, and twice that amount with silver. Even Pizarro was taken aback by this amount of wealth and instantly agreed to the ransom.