11) The capacitive level transducer is to be used to measure the depth h of liquid in a tank between 0 and 8 m. The total length I of the transducer is 9m and the ratio bla of the diameters of the concentric cylinders is 3.0. The dielectric constant ɛ of the liquid is 2.4 and the permittivity of free space ɛ, is 8.85pFm'. The transducer is incorporated into the deflection bridge R, =1002, R, = 10k 2 and voltage source V, =15 volt , the capacitance Ch when the tank is empty is R2 - R3 with ETh Co

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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.