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Download Lesson 2 - Electromagnetism
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ELECTROMAGNETISM Text book Pages 167 and 168 Magnetic materials Which of the materials below are magnetic? wood wood Question 2: Fill in the N and S pole. N S Remember the trick: Just like Canadians in the winter, magnetic field lines like to go away from the North and towards the South. Question 3: Fill in the N and S poles Question 4: Add the field lines around each magnet. BIG question for today: How can electricity create a magnetic field? Electricity and Magnetism Current Intensity: The rate of electron flow: C/s This flow of electrons can generate a magnetic field. Straight line conductors When electricity flows through a wire (straight line conductor) an magnetic field is generated. The direction of this magnetic field can be seen using a compass. The compass will point in the direction of the magnetic field. What if I don’t have a compass? Right Hand Rule CONVENTIONAL CURRENT! USE CONVENTIONAL CURRENT! What if I don’t have a compass? Right Hand Rule But... What if I don’t have a compass? There’s a trick! Grab your popsicle sticks. In our analogy, the popsicle stick is the wire. Write + and – on the ends of your stick. 2) Grasp the stick with your RIGHT HAND and with your thumb pointing in the direction of CONVENTIONAL CURRENT FLOW. (+ to -) 3) Your fingers indicate the direction of the magnetic field. 1) Determine the direction of the magnetic field. **Use the direction of the CONVENTIONAL CURRENT! (e- flow from + to -)