Lab: Magnetic and Electric Fields — Unit test Answers

What does voltage describe?

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.

How are the electric field lines around a positive charge affected when a second positive charge is near it?

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

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

Which unit is used to measure resistance?

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.

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?

Badri makes the table below to review the factors that affect the electric force between objects.

Look at the circuit diagram.

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?

The diagram shows two charged objects, A and B.

A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?