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Instructor’s informal sessions:

• Tu 3:30-4:20pm, RAS 213.
• Fri 4-4:50pm, ECJ 1.204.

Lec. 23 (iq19)

An exercise on Ohm’s law (Exam2, question 3)

Selected topics related to HW8 problems

· Torque in terms of a cross product

· e/m experiment

· Work by a magnetic force

· Hall effect

Reminder:

· Please rework all the problems in exam2 which you have missed. If you would like to see me discuss your exam performance please bring your rework-sheets with you when you come.

· HW8 is relatively short. I encourage you to complete hw 8 during the spring break and download hw9.

· If you would like have an ahead-start also preview the following chapter, i.e. chapter 31 on Electromagnetic Inductance. This chapter is relatively a substantive. We have divided it into two parts: (see the updated syllabus)

o Chapter 31a: Ch31.1-3

o Chapter 31b: Ch31.4-6

· To accommodate some students who need to travel extensively over the break, hw8 is due at 4am on the Tuesday after the break. Still, on Monday immediately after the break we will begin our discussion on Chapter 31a.