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Instructor’s informal sessions:

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

Lecture: 19 (iq15)

Demo: Magnetic field patterns of magnet, long wire RHR#1, solenoid

Magnetic force

Magnetic force

• Cross product: Polar coordinate form, RHR#2
• Cross product: Matrix of Cartesian components.

Ampere’s law:

• Long wire problem (revisit)
• A current sheet: Hint on HW7: Q11
• Digression on Amperian loops

· HW7: Q17, Long solenoid (text Fig 29.28-31)

· HW7: Q15, Toroid (text Fig 29.33)

Biot-Savart law

• B at the center of a current loop: RHR#3
• B at the center due to a circular arc, which has I, R with angle q
• B due to a line-segment wire. Given: I, a, limits of angles: q₁ and q₂.

· Direction and magnitude of B: General formula

· Long wire limit

· Current-configurations (with various geometries): Circular arc + line segments:

Reminder:

• Friday’s instructor’s informal section. Fri 4-4:50pm, ECJ 1.204.