Electric Charge

Electric Charge Interactions and Charging Methods

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They must have the same charge

Multiple Choice

Electrical forces ____.

• can cause objects to only attract each other

• can cause objects to only repel each other

• can cause objects to attract or repel each other

• have no effect on objects

Multiple Select

It is known that balloon B is charged negatively. What can you conclusively confirm about the charge on balloon A? Check all that COULD apply.

• Postive

• Negative

• Neutral

Multiple Select

It is known that balloon B is charged negatively. What can you conclusively confirm about the charge on balloon C? Check all that COULD apply.

• Postive

• Negative

• Neutral

Multiple Select

It is known that balloon B is charged negatively. What can you conclusively confirm about the charge on balloon A? Check all that COULD apply.

• Postive

• Negative

• Neutral

Multiple Select

It is known that balloon B is charged negatively. What can you conclusively confirm about the charge on balloon C? Check all that COULD apply.

• Postive

• Negative

• Neutral

Multiple Choice

Upon entering the room, you observe two balloons suspended from the ceiling. You notice that instead of hanging straight down vertically, the balloons seems to be repelling each other. You can conclusively say ...

• both balloons have a negative charge.

• both balloons have a positive charge.

• one balloon is charged positively and the other negatively.

• both balloons are charged with the same type of charge

Multiple Select

Balloons X , Y and Z are suspended from strings as shown at the right. Negatively charged balloon X attracts balloon Y and balloon Y attracts balloon Z. Balloon Z ___. List all that apply

• may be positively charged

• may be negatively charged

• may be neutral

• must be positively charged

• must be negatively charged

Multiple Choice

A conductor differs from an insulator in that a conductor ________.

• a. has an excess of protons

• has an excess of electrons

• can become charged and an insulator cannot

• has faster moving molecules

• none of these

Multiple Choice

One of these charged spheres is copper and the other is rubber. The diagram above depicts the distribution of excess negative charge over the surface of two spheres. Which is the copper sphere?

• Sphere A

• Sphere B

• Impossible to tell

Multiple Choice

Which of the diagrams best represents the charge distribution on a metal sphere when a positively charged plastic tube is placed nearby?

• A

• B

• C

• D

Multiple Choice

When an object becomes polarized, it acquires a charge and becomes a charged object.

• True

• False

Multiple Select

Charged rubber rods are placed near a neutral conducting sphere, causing a redistribution of charge on the spheres. Which of the diagrams below depict the proper distribution of charge on the spheres? List all that apply.

• A

• B

• C

• D

• E

Multiple Select

In these situations, the conducting sphere is ____.

List all that apply.

• charged

• uncharged (neutral)

• polarized

Grounding

• a negatively charged electroscope

Grounding

• a positively charged electroscope

Inducing a Positive Charge on a Sphere Using a Negatively Charged Object

Charging an Electroscope by Induction Using a Negatively Charged Balloon

Charging a Two-Sphere System by Induction Using a Negative Object

Charging an Electrophorus by Induction Using a Negatively Charged Object