A cast steel electromagnet has an air gap of length 2 mm and an iron path of length 30 cm. Find the number of ampere turns necessary to produce a flux density of 0. 8 wb/m in the air gap. Assume H = 700 AT/m for the flux density of 0.8 wb/m for the cast steel.

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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.