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A light aluminum ring is suspended from a long thread as shown in figure. when a strong magnet is moved away from it. the ring follows the magnet, why? What would happen if the magnet were moved towards the ring?

A light aluminum ring is suspended from a long thread as shown in figure. when a strong magnet is moved away from it. the ring follows the magnet, why? What would happen if the magnet were moved towards the ring?

Physics for Scientists and Engineers with Modern Physics
Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter28: Magnetic Fields
Section: Chapter Questions
Problem 31P: You are in charge of planning a physics magic show for an open house on your campus. You come up...
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A light aluminum ring is suspended from a long thread as shown in figure. when a strong magnet is moved away from it. the ring follows the magnet, why? What would happen if the magnet were moved towards the ring?

**Physics Experiment: Interaction Between a Magnet and an Aluminum Ring** --- **Question:** A light aluminum ring is suspended from a long thread as shown in the figure. When a strong magnet is moved away from it, the ring follows the magnet. Why does this happen? What would happen if the magnet were moved towards the ring? --- **Diagram Explanation:** The diagram shows a light aluminum ring suspended from a long thread. To the right of the ring is a strong magnet with its North (N) and South (S) poles labeled, and an arrow pointing to the left indicating the direction in which the magnet is moved away from the ring. --- **Detailed Explanation:** When the strong magnet is moved away from the aluminum ring, the magnetic field around the ring changes. Due to the law of electromagnetic induction (Faraday's Law), this change in the magnetic field induces an electric current in the aluminum ring. According to Lenz's Law, the direction of the induced current in the ring will be such that it opposes the change that caused it. **Explanation of Why the Ring Follows the Magnet:** - As the magnet moves away, it creates a decreasing magnetic field in the region where the ring is located. - The induced current in the ring generates its magnetic field to oppose this decrease. - This induced magnetic field interacts with the field of the magnet, resulting in an attractive force between the ring and the retreating magnet. - Consequently, the aluminum ring follows the magnet. **Hypothesis for Moving the Magnet Towards the Ring:** - If the strong magnet is moved towards the aluminum ring, it creates an increasing magnetic field in the area. - The induced current in the ring will generate a magnetic field to oppose this increase. - In this case, the ring will generate a repulsive force, opposing the approach of the magnet. - Therefore, the aluminum ring will move away from the magnet when it is brought closer. Understanding these concepts is fundamental when studying electromagnetic induction and Lenz's Law.
Transcribed Image Text:**Physics Experiment: Interaction Between a Magnet and an Aluminum Ring** --- **Question:** A light aluminum ring is suspended from a long thread as shown in the figure. When a strong magnet is moved away from it, the ring follows the magnet. Why does this happen? What would happen if the magnet were moved towards the ring? --- **Diagram Explanation:** The diagram shows a light aluminum ring suspended from a long thread. To the right of the ring is a strong magnet with its North (N) and South (S) poles labeled, and an arrow pointing to the left indicating the direction in which the magnet is moved away from the ring. --- **Detailed Explanation:** When the strong magnet is moved away from the aluminum ring, the magnetic field around the ring changes. Due to the law of electromagnetic induction (Faraday's Law), this change in the magnetic field induces an electric current in the aluminum ring. According to Lenz's Law, the direction of the induced current in the ring will be such that it opposes the change that caused it. **Explanation of Why the Ring Follows the Magnet:** - As the magnet moves away, it creates a decreasing magnetic field in the region where the ring is located. - The induced current in the ring generates its magnetic field to oppose this decrease. - This induced magnetic field interacts with the field of the magnet, resulting in an attractive force between the ring and the retreating magnet. - Consequently, the aluminum ring follows the magnet. **Hypothesis for Moving the Magnet Towards the Ring:** - If the strong magnet is moved towards the aluminum ring, it creates an increasing magnetic field in the area. - The induced current in the ring will generate a magnetic field to oppose this increase. - In this case, the ring will generate a repulsive force, opposing the approach of the magnet. - Therefore, the aluminum ring will move away from the magnet when it is brought closer. Understanding these concepts is fundamental when studying electromagnetic induction and Lenz's Law.
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