Unit Test Answers

Oran wants to model the behavior of Earth’s magnetic field when Earth’s magnetic south is near Earth’s geographic north using a ball, a bar magnet, and a compass. He designates the top of the ball as Earth’s geographic north.

Two bar magnets are held close together. When they are released, they move toward one another. Which best describes the original placement of the magnets?

A positively charged object is placed to the left of a negatively charged object. Which best describes how the positively charged object will move?

Horatio drew a diagram to illustrate how magnetism is produced by electric currents.

Parker wound a wire around a large iron nail. He then created an electromagnet by connecting the ends of the wire to different batteries. The table shows the current he measured for each electromagnet.

Measurements of two electric currents are shown in the chart.

Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?

What does voltage describe?