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Instructor’s informal sessions:

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

Lecture: 20 (iq16)

Demo

Circular orbit of a moving charge (Ch30, Sec1)

Biot-Savart law

• B at the center due to a circular arc.
• B due to a finite segment.
• B at P due to current of a semi-long wire

Magnetic force on a moving charge: (Ch30, Sec1)

• Circular orbit
• Velocity selector. Fig 30.28

Reminder:

• There is the instructor’s informal section today. It is at 4-4:50pm, ECJ 1.204.