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Transcript
Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Section Review p.522 Magnetism from Electricity USING KEY TERMS For the pair of terms, explain how the meanings of the terms differ. 1. electromagnet and solenoid An electromagnet is a solenoid that has an iron core, so an electromagnet has a stronger magnetic field than the solenoid has. 3. Describe what happens when you hold a compass close to a wire carrying a current. The needle may deflect and not point north. 5. What makes the armature in an electric motor rotate? The motor’s magnet exerts a force (up on one side, down on the other) on the armature, which causes the armature to rotate. Section Review continued 7. Making Comparisons Compare the structures and magnetic fields of solenoids with those of electromagnets. A solenoid is a coil of wire that carries electric current. An electromagnet is a solenoid that has an iron coil. An electromagnet has a stronger magnetic field than the solenoid has. Interpreting Graphics 8. Look at the image in your textbook for this Section Review. Your friend says that the image shows an electromagnet because there are loops with a core in the middle. Is your friend correct? Explain your reasoning. Possible answer: The friend is wrong. The loops of an electromagnet must be loops of wire, not ring magnets. The core of an electromagnet must be made of iron. The core in the image is a pencil. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 27 Electromagnetism
