EM Quiz

A balloon is rubbed all over with wool. The balloon will now attract the wool because the balloon and the wool

• are magnets

• have opposite charges

• have like charges

• have neutral charges

With static electricity, which particles move from one object to another

• electrons

• protons

• neutrons

• quarks

How is an electric force similar to a magnetic force?

• Both are produced by charged particles

• Both can act over a distance without contact

• Both can cause a static discharge

• Both can attract iron

Which of the following could be used as the core of a simple electromagnet?

• pencil

• plastic straw

• iron nail

• aluminum foil

A student is investigating magnets. The student uses a bar magnet, a plastic ruler, and a paper clip to perform her investigation. The student places the bar magnet at different distances from the paper clip along the ruler and observes if the paper clip is attracted to the magnet. What argument can the student make

• Magnetism depends on the materials of the objects.

• Magnetic fields are strongest at the poles of the magnet. 

• Magnetic fields exist between objects that are not in contact.

• Magnetism increases as the distance between objects increases. 

Two charged balloons repel each other. What electrical charges might the balloons have?

• Negative Negative

• Negative Postive

• Negative Neutral

• Positive Netural

John has taken a metal rod and wrapped a wire around it and attached it to a battery. John's device can produce which two forces?

• electrical force and frictional force

• electrical force and magnetic force

• frictional force and gravitational force

• magnetic force and gravitational force

Which occurs when neutral object A is charged by induction by charged object B?

• Charge transfers from object A to object B.

• Charges on object A are rearranged.

• Charge transfers from object B to object A.

• Charges on object B are rearranged.

Which of the following statements regarding electric insulators is correct?

• Electric insulators are good heat conductors.

• Electric insulators have high tensile strength.

• Charges within electric insulators do not readily move.

• Electric charges move freely in electric insulators.

When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?

• protons are transferred to the cloth

• protons are transferred to the rod

• electrons are transferred to the cloth

• electrons are transferred to the rod