In the figure below left is a toroidal solenoid. The xy plane lies through the middle of tne solenoid. It consists of densely wound wires wrapped around into a doughnut shape. ie: a cylindrical solenoid which is then bend so that both ends are touching. A current I travels through the wire. The inner radius is a and the outer radius is b. There are N loops of wire. (a) Calculate the magnetic field B or Ĥ directly in the middle of the solenoid (inside the coils) at a distancer indicated below. This must be in terms of N, I,r, a, or b. Also, what is the magnetic field in the xy plane outside of the coils (for r < a and r > b. Hint: do not use the biot-savart law. (b) What is the magnetic field B, in Tesla, if N = b = 11cm. 100, r = 10.0ст, I — 1.0Атp, а — 9ст b

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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.