Electric and Magnetic Forces

Which object would be attracted by a magnet?

Choose the correct answer.

• an iron nail

• a latex balloon

• a piece of paper

• an aluminum paper clip

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An object is most likely to become electrically charged by gaining or losing which type of particles?

Choose the correct answer.

• neutral particles

• positive particles

• • negative particles

• • none of the above

Which of these best describes electric charge?

Choose the correct answer.

• • a particle that moves freely through matter and causes static electricity to build up on objects

• a fundamental property that causes electric and magnetic interactions

• a force that causes objects to heat up

• • a high-voltage material that can cause damage to objects

Which of these is an example of a force that acts at a distance?

Choose the correct answer.

• An airplane experiences friction as it moves through air.

• A book experiences a normal force as it rests on a table.

• A soccer ball experiences a force as it is kicked across a field.

• A magnet is pushed away when it is brought near the end of another magnet.

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Which of these best describes how a powerful electromagnet could be used in a junkyard?

Choose the correct answer.

• • It could move heavy objects made of iron.

• • It could convert electrical energy into mechanical energy.

• • It could light up the area so workers can see at night.

• • It could provide a voltage source for old electronic equipment.

Tags

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The picture shows iron filings around magnets.

What relationship is shown in the picture?

Choose the correct answer.

• Electric force between like ends is attractive.

• Electric force between opposite ends is attractive.

• • Magnetic force between opposite ends is attractive.

Tags

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The diagram shows a balloon that was rubbed with a cloth. Which statement describes the charges?

Choose the correct answer.

• Negative charges from the cloth were transferred to the balloon.

• • Balloons always have more negative charges than positive charges.

• Some positive charges on the balloon disappeared when it was rubbed by the cloth.

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Where is the magnitude of force around this object the greatest?

Choose the correct answer.

• • The magnitude is greatest close to the poles.

• The magnitude is greatest far from the poles.

• • The magnitude is equal at all points on the field.

• The magnitude is greatest halfway between poles.

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The end of one bar magnet is placed near the end of another bar magnet. The two ends seem to push each other apart. Which of these statements is true?

Choose the correct answer.

• The two ends are like poles.

• • The two ends are unlike poles.

• There are like charges on the two ends.

  There are like charges on the two ends. - no response given

• There are unlike charges on the two ends.

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Which material is least likely to be affected by a magnetic field?

Choose the correct answer.

• Plastic ruler

• Steel screw

• Iron rod

• Nickel coin

Tags

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