Unit Test — Unit test Answers

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

Masako measures a circuit at 12 V and 2 A. Using Ohm's law, what can he calculate for the circuit?

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

Measurements of two electric currents are shown in the chart.

Linh builds a circuit from the diagram shown.

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?

Dr. Eriksson is working on a material called selenium. She is adding a certain number and type of atoms to the selenium, which will control its conductivity.

What must be true in order for magnetism to induce an electric current in a wire?

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

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.

The diagram shows two charged objects, A and B.

Liang is working with an electrical circuit. She replaces a straight electrical wire with a coiled wire.