A long, straight wire has a radius R=0.5cm and carries a current I=10A that is NOT uniformly distributed over the cross-sectional area of the wire. It is found that the current density of the wire j depends linearly on the radius r, that is j(r)= jo r /R. a. Find jo. What physical quantity does it represent? b. Using Ampere's Law, derive the general expression for B as a function of r for rR. Then find the direction and

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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.