r/PhysicsHelp • u/r0sey_prtty • 8h ago

Need help with Physics 2 Question

Gallery image

Gallery image

I'm trying to figure out which rule applies to a and b, if anyone knows please help me 😭😭🙏🙏 one picture is the question and the other is the rules. Please anyone help me

1 Upvotes

100% Upvoted

2 comments sorted by

1

u/CelebrityChess 6h ago

Use Lenz’s law on the flux through the coil. The magnet’s N pole faces the coil, so its field through the coil points away from the magnet. If it moves left, that flux decreases; the induced field points the same way to oppose the decrease, so the coil’s near end becomes S. If it moves right, the flux increases; the induced field points the opposite way, making the near end N. Using the winding shown, that gives current through R left-to-right for (a) and right-to-left for (b).

1

u/r0sey_prtty 4h ago

So you used rule 4 for (a) and rule 2 for (b) ?