1 Magnetic Field Generator Toroid 2 Example Force Between Parallel Currents Four long wires are parallel to each other their cross sections forming the corners of a square with side a 20 cm. A 20 A current exists in each wire and is out of the page. What is the force per unit length (magnitude and direction) on any of wire. 3 Magnetic Induction Generating Electricity 1. A current appears only if there is relative motion.
Fast motion produces a greater current.
3. Clockwise/counter clockwise current with north pole move in/out. Opposite with south pole. Induced current in secondary coil if there is change of current in the primary coil switch or ac current Transformer 4 Faradays Law of Induction Electric Flux through area A Magnetic flux through area A Amount of electric (magnetic) field passes through an area A (Weber or Wb or T m2 For uniform B Faradays Law of Induction An emf is induced in a loop when the magnetic flux that pass through the loop is changing. The the loop is conducting then a current will flow. For a loop with N turns Change B (change current) Change A Change angle between them
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