Solve the following problem:
Q: For a particular npn transistor operating at a vBE of 680 mV and IC = 1 mA, the iC-vCE characteristic has a slope of 0.8 × 10-5 Ω. To what value of output resistance does this correspond? What is the value of the Early voltage for this transistor? For operation at 10 mA, what would the output resistance become?