1. Lesson 5 More Magnetism and Current Liceo Alfano

2. Reminder Force of a magnetic field on a moving charged particle: F = q v x B Right hand rule: Thumb in the direction particle is moving Other fingers in the direction of the magnetic field Force comes out of your palm

3. Reminder A wire with current creates a magnetic field around it Right hand rule: Thumb points in the direction of current Fingers curl in the direction of the magnetic field

4. Reminder Question I have a coil with current I and radius R, as shown. Which way is the magnetic field at point P? 1) Up 2) Down 3) Left 4) Right 5) Into the page 6) Out of the page

5. Reminder Question I have a coil with current I and radius R, as shown. Which way is the magnetic field at point P? 1) Up 2) Down 3) Left 4) Right 5) Into the page 6) Out of the page

6. Concept Question If I have two parallel wires with currents moving in the same direction, the wires will 1) Attract 2) Repel 3) Push in another direction 4) Nothing will happen

7. Concept Question If I have two parallel wires with currents moving in the same direction, the wires will 1) Attract 2) Repel 3) Push in another direction 4) Nothing will happen

8. Videos Parallel wires animation What do you think would happen if the currents went in different directions? Parallel wires in series animation Parallel wires video

9. Force on a Current Loop Let’s look at a loop of current in a magnetic field Which direction is the force on each part of the wire? What do the forces cause the loop to do?

10. Electric Motor This is how an electric motor works! Use a magnetic field to cause a wire to turn, which can be used to do work Electric motor experiments

11. Electromagnets We learned that a wire with current running through it creates what? Is this magnetic field strong enough to have a large effect? (think: do the wires in your house attract paper clips?) How can we make the magnetic field stronger? Loops! We can create an electomagnet by looping a wire with current around a conductor, i.e. a screw

12. Video Electromagnet experiment

13. Experiment Magnetic field induction experiment