An electromagnet is used to support a solid piece of steel, as shown in the figure below. A force of 10,000 N is required to support the weight at a distance of x=0.5m. The cross-sectional area of the magnetic core (the fixed part) is 0.01m2. The coil has 1,000 turns. Assume negligible reluctance in steel and negligible fringing in the air gaps. Fixed N

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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.