Name: ID: C Free Response 18. (3 pts) The diagram below is an electromagnet with the direction of the current shown. On the diagram A) (1 pt) Draw several magnetic field lines to indicate what the magnetic field looks like, B) (1 pt) Draw the direction of the magnetic field on the magnetic field lines, and C) (1 pt) Correctly label the poles of the electromagnet. 19. (5 pts) The diagram below represents a speaker with most of its necessary parts labeled. Alternating current through the wire Cone that Coil of wire with vibrates to electricity ?? create sound A) (1 pt) Identify what this unlabeled item (the part labeled with "???") in the diagram must be in order for this speaker to function correctly. B) (4 pts) Explain the purpose for the part of the speaker you identified in Part A and how it interacts with the coil of wire to produce sound. In other words, explain why is this item needed for the speaker to function properly