The circuit below is composed of a Wheatstone bridge and amplifier. A Wheatstone bridge is a type of circuit commonly used to convert resistance changes into voltage changes; the most common device used with a Wheatstone bridge is a strain gauge. A strain gauge is a sensor that converts strain (changes in length) to a change in resistance. Essentially a strain gauge is just a wire being stretched (recall a resistor's resistance depends on length; if you stretch it, its resistance will change!). The resistance change of a strain gauge is very small (order of milli-ohms), and as such, the voltage difference between the two arms of the bridge is typically amplified Your task is to determine the amplifier's gain, b, that will result in a relationship between output voltage and change in resistance such that, Vo-5 volt. AR ohm Assume the strain gauge's base value is R gauges) 1200(a typical value for many strain 100Ω | Voltage Output To DMM 10V 7 0 Wheatstone Bridge Amplifier

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0