Electricity & Magnetism Review

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

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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

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Which pair of magnets would result from cutting this magnet in half?

• N S | S N

• N S | N S

• N S | S N

• S S | N N

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

• A and B

• B and C

• A and C

• C and D

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This structure produces power for use in the home by converting _______.

• chemical energy into mechanical energy

• electrical energy into mechanical energy

• chemical energy into electrical energy

• mechanical energy into electrical energy

The picture shows an experiment used to determine the effect of using more nails in the core of an electromagnet. Which of the following would make this a better-designed experiment?

• using a different number of batteries for each electromagnet

• using the same number of turns of wire for each electromagnet

• inserting an ammeter in each circuit between the battery and the nails

• using a different size battery for each electromagnet

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The diagram above 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

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A magnet will not attract all metal objects. Which material below will not attract a magnet?

• iron

• aluminum foil

• cobalt

• nickel

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Sandra is trying to identify an unknown substance. She determines by testing that the material has a density of 7.5 g/cm3 and can be picked up by a magnet. She concludes that the substance is ________.

• iron
• wood

• plastic

• calcium

Hamed wanted to find out how to make an electromagnet stronger. The results of his experiment are listed in the table above. According to these data, which of the following does not make an electromagnet stronger?

• increasing the number of batteries that are connected

• increasing the number of wire turns around the core

• increasing the number of nails inside the core

• increasing the number of tacks used

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