Charge and Coulomb's Law

If you half the distance between two charged objects, what happens to the magnitude of the force between them?

• Increased by a factor of 2

• Increased by a factor of 4

• Decreased by a factor of 2

• Decreased by a factor of 4

Tags

NGSS.HS-PS2-4

Which of the following are electrical insulators?

• Pure water

• Saltwater

• Asphalt

• Dry cotton

"The algebraic sum of all the electric charges in any closed system is constant."

What does this statement describe?

• Quantization of Electric Charge

• Conservation of Electric Charge

• Principle of Superposition

• Conservation of Energy

A glass rod and a cotton shirt are rubbed together. Which material becomes negatively charged?

• Cotton shirt

• Glass rod

• Both

• Neither

Tags

NGSS.MS-PS2-3

If we rub together wool and brass, what will be the resulting charge on the brass?

• Cannot be determined

• Neutral

• Positively charged

• Negatively charged

What is the mass of a proton?

• $1.602\times10^{-19}\ kg$
  

• $1.675\times10^{-27}\ kg$

• $1.673\times10^{-27}\ kg$

• $9.11\times10^{-31}\ kg$

How many excess electrons are there in an object with a charge of  $-35e$ ? The letter  $e$  represents the elementary charge.  

• -35

• 35

• 0

• Cannot be determined

If a negative charge is placed on the origin and a positive charge is placed on its right, what is the direction of the force experienced by the positive charge?

• North

• South

• East

• West

Tags

NGSS.HS-PS2-4

Rod Z is attracted to rod X, but rod Y is repelled by rod Z. If rod X is negatively charged, what is the charge of rod Y?

• Negatively charged

• Positively charged

• Neutral

• Not enough information

Tags

NGSS.HS-PS2-4

If an object has 300 excess electrons, what is its net charge? ( $e$ represents the elementary charge)

• 0

• $+300e$

• $-300e$

• $\pm300e$