Electromagnetism

The diagram above shows the magnetic field surrounding a bar magnet. The closer together the lines of force, the stronger the magnetic field. According to the diagram,where is the magnetic field strongest?

• around the north pole

• around the south pole

• around both poles

• in the center of the magnet

Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the kitchen counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned because _______________.

• the electric current in the outlet produced a magnetic field

• the compass could only be used outdoors

• the kitchen counter was made of a magnetic substance

• the kitchen had a microwave oven

A magnetic field exerts a force on ______.

• other magnets

• objects made of magnetic materials

• other magnets and objects made of magnetic materials

• none of these

The generation of a current by a changing magnetic field is called electromagnetic______.

• discharge

• charge

• induction

• reduction

Why does the north pole of a compass point toward Earth's geographic north pole?

• A compass does not rely on Earth's magnetic field to function.

• Like poles attract.

• Opposite poles repel.

• Earth's geographic north pole is a south magnetic pole.

According to the diagram, which pair could both be north poles?

• A and B

• B and C

• A and C

• C and D

The ______ are regions where the magnetic force exerted by a magnet is strongest.

• magnetic field lines

• anodes

• magnetic poles

• cathodes

The diagram shows an electric motor and a generator. Which two areas of physical science are closely related to the development of these devices?

• sound and light

• light and magnetism

• electricity and sound

• electricity and magnetism

Scientists believe that magnetism is caused by the spin of certain atomic particles called

• electrons.

• protons.

• neutrons.

• nuclei.

Which of the following is found in all magnets?

• a geographic pole

• a transformer

• a north pole and a south pole

• an electric field