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Instructor’s informal sessions:

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

Midterm 2: March 3/12, Th 7-8:30pm, FAC 21

Lec. 22 (iq18)

More discussions on unit2.

• An exercise on Biot-Savart law: A triangular current loop
• More on motion of a charge particle in a constant uniform B

Magnetic-current identity:

· B-pattern

· Net for due to a constant B field

· Net torque due to a constant B field

Reminder:

· HW8 is relatively short. If possible, please complete hw 8 during the spring break. Then download hw9 and preview the chapter 31 on Electromagnetic Induction.

· 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 31.