Which object would have the most momentum? a. a 500-pound car moving at 20 miles per hour b. a 200-pound car moving at 60 miles per hour c. a 100-pound car moving at 80 miles per hour d. a 50-pound car moving at 100 miles per hour

The space within which a test north pole experiences a force magnetic poles 2. a powerful stream of electrons flowing high above the earth in the ionosphere electrojet 3. a concept to explain the directional nature of a magnetic field field lines 4. coil of wire designed to produce a magnetic field by a current passing through its windings ionosphere 5. that region above the earth's atmosphere where particles exist in an ionized state magnetic field 6. the extremities of a magnet where the field lines tend to converge or concentrate aurora borealis 7. a phenomenon that occurs in the northern latitudes; the northern lights solenoid