A. When bar magnet moves to right is Right ; When bar magnet moves to left is Left
B. When bar magnet moves to right is Right ; When bar magnet moves to left is Right
C. When bar magnet moves to right is Left ; When bar magnet moves to left is Right
D. When bar magnet moves to right is Left ; When bar magnet moves to left is Left
参考答案:
A
本题详细解析:
Explanation:
When the bar magnet moves towards and away from the ring, the magnetic flux through the ring will change. According to Lenz's law, an emf, and therefore a current is induced to oppose the change in the flux. So as the bar magnet approaches the metal ring, the metal ring moves to the right due to repulsive forces that resist the decrease in distance between the ring and the magnet. Likewise, as the bar magnet moves away from the metal ring, the metal ring moves to the left.
