- field lines always go from N -> S
- dot means out of page, cross means into page
- ${E_1 \over E_2}={r_1 \over r_2}^2$
- field lines always go from N -> S
- dot means out of page, cross means into page
- ${E_1 \over E_2}={r_1 \over r_2}^2$
### Lenz's law
- Right hand grip rule (relationship between directions of $I, F$)
- Eddy currents counter movement within a field
### Lenz's law
- Right hand grip rule (relationship between directions of $I, F$)
- Eddy currents counter movement within a field