Physics - Chapter 22

22.1 §

• End of a freely rotating bar magnet that points towards the north geographic pole of the earth is the north pole
• The opposite end of the magnet is south pole
• Breaking a bar magnet produces new poles making a north and south
• Magnetic Field - Force field that surrounds any magnetic material
• North geographic pole of Earth is near the south pole of Earth’s magnetic field
• Magnetic Domain - A region within a magnetic material where the electrons are aligned in the same direction

22.2 §

• Stationary electric charge produces an electric field but not a magnetic field, As you move the charge magnetic field is generated
• Magnetic field for a long straight wire
  • B = $\frac{{\text{micro}}_{0}I}{2\pi r}$
  • SI Unit: Tesla (T)
• Wires with currents in the same direction experience an attractive force
• Wires with currents in the opposite direction experience a repulsive force
• Solenoid - Electrical Device in which a long wire is wound into a succession of closely spaced loops
• Magnetic Field of a Solenoid
  • B = ${\text{micro}}_0$ ($\frac{N}{L}$)I
  • SI Unit: Tesla (T)

22.3 §

• Magnitude of the Magnetic Force, F
  • force = |charge| x velocity x magnetic field x sin $\theta$
  • F = |q|vBsin$\theta$
  • SI Unit: Newton (N)