The circuit in the figure (next slide) shows an opamp used as a voltage comparator. The resistance of the thermistor shown decreases with increasing temperature. With the resistor cold, the output voltage is at maximum -15V, the power supply being +15V and -15V. a) What is the voltage at the inverting input of the opamp? b) What voltage would the non inverting input have to reach for the output to switch to maximum positive + 15V ? c) What would be the resistance of the thermistor at this point? Example - Comparator (Cont.) TH 47KQ2 + A +15V 2.2 ΚΩ 100ΚΩ -15V Vout 146​