A teacher asks four students to go up to the chalkboard. She asks them to draw the orbit of Earth as it travels around the Sun. The teacher also asks the students to draw the diagram as
if they are looking down on the North Pole of Earth. Which student drew the BEST diagram
that reflected the teacher's instructions?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)