Positive and Negative Charges

If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?

• A positive charge.
• A negative charge.
• A neutral charge
• No charge at all

An object that is positively charged contains all protons and no electrons.

• True
• False

An object that is neutral contains the same number of electrons and protons.

• True
• False

The process of transferring charge between objects by touching or rubbing

• charging by induction
• static discharge
• charging by contact
• proton

Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

• A has a positive charge

• B has a negative charge

• A and B have opposite charges

• A is neutral

Tags

NGSS.MS-PS2-3

How does a neutral object become positively charged?

• remove protons

• remove electrons

• add electrons

• add protons

Protons and Electrons balance the charge of an atom.

• True
• False

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 12 neutrons
• 12 electrons
• 12 protons
• 24 protons and neutrons

Two balls are placed near one another and hang down, as shown below.

Which conclusion is supported by this evidence?

• Neither ball has a charge.

• The balls are both positively charged.

• One ball is positively charged, and the other is negatively charged.

• Each ball has a charge, but the type of charge is unknown.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

How does increasing the distance between charged objects affect the electric force between them?

• The electric force increases because the distance has an indirect relationship to the force.

• The electric force increases because the distance has a direct relationship to the force.

• The electric force decreases because the distance has an indirect relationship to the force.

• The electric force decreases because the distance has a direct relationship to the force.

Tags

NGSS.MS-PS2-3