# Lenz's Law

I'm having trouble understanding the explanation given to me for this question. Would someone please be able to tell me the answer with a detailed explanation? Thanks in advance.

A solid metal rod is moved vertically up through two permanent magnets as show. Which end of the rod is negative? (and why)

Note by Felix Haydock
4 years, 2 months ago

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Using Right Hand Palm Rule: Thumb points up, fingers point towards south, resulting force on positive charges is towards Y. Therefore X is negative.

Check using Lenz's Law: Induced current should oppose the original movement.

To check, use Right Hand Palm Rule: Thumb points towards Y (direction of movement of positive charges) fingers point towards south (the direction of the existing field) palm points down (direction of force). This force opposes the original motion of the rod.

- 3 years, 10 months ago