8-) A long, East-west-oriented power coble corrying on unknoun current I is at a heght of 6m above the Eorth's surfoce. If the magre tic flux density recor ded by o magre tic-field meter placed at the surface is 12pT when the current is flouing through the cable ond 24pt when the current is 2 ero, what is the magritude of I?

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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.