PH 102 Midterm: PH102_S07_Exam2
Document Summary
Instructions: solve 8 problems out of the 12 below. All problems have equal weight: clearly mark the problems you choose by lling in the adjacent circle, show as much work as possible for partial credit, solve the problems on separate sheets. Staple your sheets to the exam when nished. Two long parallel wires, each with a mass per unit length of = m/l == 0. 040 kg/m, are supported in a horizontal plane by 6. 0 cm strings, as shown at left. Each wire carries the same current i, causing the wires to repel one another, which causes the supporting strings to make an angle = 16 with one another. Hint: consider the free-body diagram for one of the wires in the upper right. If a wire has mass m and length l, = m/l. (cid:13) 2. Sodium ions (na+) move at 0. 85 m/s through a bloodstream in the arm of a person standing near a large magnet.
