# Homework Help: North-south plane

1. Jul 17, 2011

### reyunknown

can i Ask what do they mean by 75 degree below the north -south plane?
North-southplane and north-south axis is the same thing?

2. Jul 17, 2011

### HallsofIvy

They shouldn't- a "plane" is not an "axis"- but that is clearly what is meant. South to North is a single direction, a single line, and a single line does not define a plane. They have to mean the "North-South" axis.

3. Jul 17, 2011

### reyunknown

At a certain location, Earth has a magnetic field of 0.60 × 10−4 T, pointing 75° below the horizontal in a north–south plane. A 10.0-m-long straight wire carries a 15-A current. (a) If the current is directed horizontally toward the east, what are the magnitude and direction of the magnetic force on the wire? (b) What are the magnitude and direction of the force if the current is directed vertically upward?
so how do i answer this ques? I dun get imagine the diagram..with the north-south axis

4. Jul 18, 2011

### cupid.callin

75° is the angle of dip