м 1=0 12 V Figure P14.44

Q2. a) (i) For current measurement applications, derive an expression for the open circuit voltage developed across the terminals of a Rogowski coil. Assume that the coil has a radius, R, and N turns of radius, r. Use a suitable drawing to indicate the various quantities/variables used in your equations. (ii) Explain briefly how you change this Rogowski coil into a current transformer.

You have developed an idea for using a poly Si surface‐ micromachined cantilever. Initially, you designed a process flow for creating this simple structure, and the process flow is detailed in the figure below. ( cross section view and top view)There are several critical errors with this process (things that won’t work or won’t produce the result). Please find the critical errors in this process flow and, where possible, suggest alternate approaches. Do not worry about the accumulation of errors, but rather treat each step assuming that the structure up to that step could be created.This structure is actually quite simple to make. Develop a simpler process flow and associated masks to create the final structure. Be sure to show cross‐sectional and planar views of all key steps in the process.

Consider the circuit shown in Figure P14.36. The two coils have L1=0.1 H, L2=10 H, and M=0.5 H. Prior to t=0, the currents in the coils are zero. At t=0, the switch closes. Determine and sketch i1(t) and i2(t) to scale versus time.