E&M Quiz C

How do electrons differ from protons?

• They are the same thing
• Electrons hold a negative charge and protons hold a positive charge.
• Electrons are positively charged and protons are negatively charged.
• Protons are neutral 

Which of the following will repel one another?

• the North pole and South pole of a magnet

• a negatively-charged balloon and your positively-charged hair

• two positively-charged objects

• two objects that have the opposite charge

As the person walks across the floor he scuffs electrons off of his shoes, he becomes ______- charged while the floor becomes _______- charged.

• positive, negative

• negative, positive

• negative, positive

• positive, negative

Will the balloons ATTRACT or REPEL each other?

• 
• 

Recap:

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

• increase; increase

• increase; decrease

• decrease; increase

• decrease; decrease

A student creates identical electrical charges on identical balloons by rubbing them with a wool cloth. The balloons repel each other. According to Coulomb's Law, which should the student do to increase the electrical force of repulsion between these balloons?

• Increase the distance between the balloons.

• Increase the charge on one of the balloons.

• Increase the masses of the balloons.

If the charge on both of the objects is doubled, what would happen to the electrical force between them?

• It would double. (2 times greater)

• It would quadruple (4 times greater)

• It would become ½ as much. (decrease)

• It would become ¼ as much.(decrease)

The distance between two charged objects is tripled. Which calculation shows how the electrical force between them changes?

What will happen when these magnets are brought close together?

• They will attract each other.
• They will repel each other.
• Both magnets will turn to the left
• Both magnets will turn to the right

Where is the strongest force of a magnet present?

• the ends

• the middle

• its equal everywhere