A student made the table shown to list some contact and non-contact forces. Examples of Forces Contact Forces Non-Contact Forces The force exerted by a stretched spring The force applied by Earth and sun on each other The force exerted by a positive charge on a negative charge The force exerted on hair by a balloon rubbed on hair Which statement best explains why the table is incorrect?

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.)