o Course homepage, Ongoing Lectures, TT-system 

• Instructor’s weekly informal sessions:

Tu 3:30-4:20, RAS 213 ; Fri 4-5, RLM 5.104

Midterm 2: Th 7-8:45pm, WCH 1.120

Lecture: 21 Review unit 2

Course summary: The part covered in midterm2.

Pay attention to the physics in HW5, HW6 and HW7 + Magnectic force law for current segment.

Review examples:

Chapter 27

· p238: P=I²R.

· p228: Ratio of E’s and ratio of drift velocity.

· p230: Resistivity

· p229: The physics behind the Ohm’s law

Chapter 28

· p239 Ohm’s law in an electric net work

· p236: Two loop network

· p240 RC Circuit charging case

· p243: Characteristic time: t=R_effC_eff

· p241: Application of K-rules in an RC network. HW6: Q21.

· HW6: Q22: Effect characteristic time after the battery is disconnected.

· HW6: Q23. RC- charging case and the discharging case

Chapter 29

• p259: Magnetic force
• p245: Magnetic force between || wires.
• p247: Velocity selector

Ampere’s law

HW7 Q10: Current with a planar symmetry

Q13: Cylindrical symmetry

Q15: Toroid

Biot Savart’s law:

• p251: Circular arc
• p250: Current loop, RHR#3
• p253: line segment

Reminder:

• There is an instructor’s informal section tomorrow. See time and place above.