A magnetic circuit made of mild steel is arranged as shown in Fig.3. The cent.ral limb is wound with 500 turns and has a cross-sectional area of 800 mm. Each of the outer limbs has a cross-sectional area of 500 mm. The air-gap has a length of Imm. Calculate the current required to set up a flux of 1.3 mWb in the central limb. Take u,-600 and neglect leakage. 1=120 mm la =300 mm 1 mm Fig.3

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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.