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Instructor’s informal sessions:

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

Lecture: 18 Magnetostatics I (iq14)

Magnetic field

• Bar-magnet and Compass needle

· Electric dipole field: E-pattern

· Magnetic dipole field: B pattern

• B due to a long wire. Figs 29.9, 29.10 and 29.14.

Magnetic force

• Why should there be a magnetic force on the current segment?
• The force formula in terms of a cross-product. Fig29.12
• Magnetic force on a moving charge.

Application: The force due to the magnetic field of a long wire on a moving charge. (Fig 29.6) Exercises.

• Case 1: v || to the current.
• Case 2: v is away from the current.
• Case 3: v || to B.

Ampere’s law

• emf along a loop
• mmf along a loop
• Ampere’s law
• Applications

Reminder:

• Tuesday instructor’s informal section. See time and place above.
• Read chapter 29 and start HW7.