Learning objectives Describe the general properties of the magnetic field of a magnet and the Earth's magnetic eld. initial ideas 1. Predict what will happen in the following situations: [Em attractions or repulsions} E. 2. Compasses are an instrument made up of a needleshaped magnet used to locate the poles of the earth. Since the compass is a magnet, which pole of the magnet is the red tip of the compass? 3. Complete the following image with your prediction about which is the north pole, and which is the south pole on the following magnet. Notice that at the corners ofthe magnet are two compasses. Side A is the pole: Side Bis the pole: 7. In the following image, draw in your notebook, your prediction of the orientation of the compass needle, using red and black pen at the points marked in the image. Take a photo of your prediction and paste it here. . A S N .B . C . E . D Check your prediction with the simulation. (In this section each point A, B, C, D and E are small compasses like the one represented on the right of the image. Once the compass is placed on these points, predict where the compass will move) You can use the simulation of Phet to confirm your predictions. 8. Describe how the interaction of the compass with the magnet depends on the distance of the compass from the magnet and its position. Devise a method by which you can determine approximately the magnitude of the magnetic field at each of the marked positions. Explain reasoning.applying knowledge 1. Three bars marked 1, 2, and 3 have the letters A and B at their ends as shown in the picture. B B B Barra 1 Barra 2 Barra 3 A student collected the following observations: a-Side 1B repels side 3A 8 B-side 1A attracts side 2B c-Side 2B attract side 3B Indicates what each of the bars is: magnet, ferromagnetic object, non-ferromagnetic object or if it is not possible to identify it. Bar 1 is a: Bar 2 is a: Bar 3 is a:5. Explore the simulation by selecting the "Show Planet Earth\" option. Complete the following picture and describe how your observations explain the poles of the earth