Determining CCW or CW about a wire/loop

[ieatshrimp24]

---

Members don't see this ad.

This is a question on magnetism, specifically Lenz's Law and the right hand rule.

If a loop enters a magnetic field that is pointing into the page, Lenz law states that the loop will oppose the direction of the field. Therefore the magnetic field produced by the loop will point out of the page. However, how do I determine the direction of the current in the loop? Same question if the loop is exiting the magnetic field? Thanks.

 

[erythrocyte666]

If B field points out, make your thumb point out and curl your fingers to see that the loop will have CCW current.
When loop exits, change in magnetic flux points out of page (since flux into the page is decreasing), so loop will produce B field into the page and you'll have CW current