Interactions between Electricity and Magnetism

1
Interactions between Electricity and Magnetism

• Interactions between electricity and magnetism
  all involve some motion of either charges
  (electricity) or changes in the magnetic field.

2
Magnetic Force

• Magnetic Force
• There is a magnetic force whenever a charge (or
  charged object) moves across a magnetic field.
• The equation for this is F q v B
• q amount of charge (C)
• v velocity
• B magnetic field (Teslas)

3
Right Hand Rule 1

• Extend your thumb, its the direction of the
  current.
• Point fingers in direction of the Magnetic Field,
  B. (Fingers field lines)
• Orient your palm so its the direction of the
  force (Palm Push)
• This force happens only when the charge moves
  perpendicular to the magnetic field B.

4
Right Hand Rule 2

• To determine the direction of the circular
  magnetic field around a wire carrying a current.
• Direct your thumb along the wire in the direction
  of the current.
• Your fingers curl in the direction of the
  circular magnetic field.

5
Mag/Elec Interactions

• Electro-magnets
• If you coil a wire into a helical form (like
  wrapping a wire around a cylinder) and run a
  current through it, each circular coil creates a
  small mag field.
• The mag field from each coil adds up to create
  what looks like a magnet with a North and South
  pole.
• By running a current through this wire, you
  make a magnet. This is also known as a solenoid.