PH 102 Midterm: ph102_sum08_exam2
Document Summary
Summer ii 2008: answer 2 out of 4 questions in each section below. All problems have equal weight: clearly mark the answer you choose using the tick boxes, show your work for full credit. Signi cant partial credit will be given: you are allowed 2 sides of a standard 8. 5x11 in piece of paper with notes/formulas and a calculator. 1 dc circuits - solve 2/4 (cid:3) 1. A black box with three terminals, a, b, and c, contains nothing but three resistors and connecting wire. Measuring the resistance between pairs of terminals, you measure rab = 30 , rac = 60 , and rbc = 70 . Show that the box could be either of those below. 1 0 a c a c (cid:3) 2. Find the current in the two batteries below, and nd the power they deliver. A copper wire 1 km long is connected across a 6 v battery.
