*5.31 Iron contains 9,5x 1028 atoms/m³. At saturation, the alignment of the electrons' spin magnetic moments in iron can contribute 2.5 T to the total magnetic flux density B. If the spin magnetic moment of a single electron is 11,27x 10–24 (A-m²), how many electrons per atom contribute to the saturated field?

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.