True/False and multiple choice questions. Provide a brief explanation (a couple of sentences) to justify your answer. (a) A Faraday cage is a closed container that is made of conducting material. Suppose that a Faraday cage is placed in an external electric field E. True or False: The electric field E inside this container is zero. (b) Consider an infinitely long straight wire with current travelling in the ê direction. True or False: The magnetic vector potential A at a point P located at some distance from this wire points in the radial p direction. (c) Consider the figure at the bottom left, which is an infinitely long coaxial wire and is cylin- drically symmetric. The inner wire (radius R1) is conducting current which flows out the page and is equal to 1.0 Amperes. The outer wire (hollow cylindrical shell radius R2) is also conducting current which flows into the page and is also equal to 1.0 Amperes. True or False: The magnetic field (H or B) is equal to zero outside of this arrangement

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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.