The magnetic circuit in Fig.4 has following dimensioņs: 1,=10 cm, 2=l;=18 cm, cross-sectional area of l, path=6.25 cm, cross-sectional area of l2 and l; path=3 cm', length of air gap=2mm. Taking the relative permeability of the core material as 800, find the required current in the 600 turn exciting coil so as to establish a flux of 100 uwb in the air gap. Neglected leakage and fringing.

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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.