Geomagnetism

1
Geomagnetism

• The North pole of a small magnet (compass) points
  towards geographic North because Earths magnetic
  South pole is up there!!

2
We saw that
B
I
A B-field must surround the current carrying wire
like
2
3
1
Obviously 2 since top and bottom mean nothing
to the current, and were the wire twisted upside
down, the effect would be unchanged.