Electric Charge and Franklin's Model

In the mid-1700s, Benjamin Franklin conducted experiments to understand electrical charges. He identified two types of charges, naming them positive and negative. Using materials like rubber rods, animal fur, glass rods, and silk, he observed that rubbing these materials together caused them to attract or repel small objects like pith balls. Franklin concluded that there were only two types of charge and developed the 'one fluid model,' suggesting that a lack of one type of charge results in the gain of another. This model explained the transfer of positive charge from silk to glass and the negative charge from plastic to fur.

What did Benjamin Franklin determine about electric charge in the mid-1700s?

• Charge is a myth.

• Charge does not exist.

• There are only two types of charge.

• There are three types of charge.

Which materials did Franklin use to demonstrate charge acquisition?

• Wood and metal

• Plastic and paper

• Copper and wool

• Rubber rod and animal fur

What happens when a charged object is brought near a pith ball?

• The pith ball remains stationary.

• The pith ball is initially attracted and then repelled.

• The pith ball changes color.

• The pith ball explodes.

What conclusion did Franklin reach about the types of charge?

• There are only two types of charge.

• There are multiple types of charge.

• There is only one type of charge.

• Charge cannot be classified.

What charge does a rubber rod acquire when rubbed with fur?

• Positive

• No charge

• Neutral

• Negative

What charge does a glass rod acquire when rubbed with silk?

• No charge

• Negative

• Neutral

• Positive

What is the main idea behind Franklin's 'one fluid model'?

• A lack of one type of charge results in the gain of another.

• There are three types of charge.

• Charge is a solid substance.

• Charge is a fluid that can be seen.

According to Franklin, what happens to the silk when rubbed against the glass rod?

• It gains a negative charge.

• It remains unchanged.

• It loses a positive charge.

• It gains a positive charge.

What happens to the plastic rod in Franklin's model when rubbed with fur?

• It loses its positive charge.

• It loses a negative charge.

• It gains a positive charge.

• It becomes neutral.

What did Franklin prefer in his 'one fluid model'?

• No charge

• Neutral charge

• Positive charge

• Negative charge