Static Charges

A student is designing an investigation of the distribution of charges in conductors. She will use two conducting spheres mounted on insulating stands in the investigation. What should the student do to get the shown results?

• She should place a negatively charged rod near the left sphere.

• She should place a positively charged rod near the left sphere.

• She should place two negatively charged rods near each sphere.

• She should place two positively charged rods near each sphere.

Tags

NGSS.MS-PS2-3

Noah touches a negatively charged plastic rod to a metal sphere. How do the negative charges distribute themselves on the sphere?

• They stay on the top surface of the sphere.

• They stay on the bottom surface of the sphere.

• They spread out evenly on the surface of the sphere.

• They spread out unevenly on the surface of the sphere.

Which of the following is the process of charging a conductor by bringing it near another charged object and then grounding the conductor?

• ionization

• induction

• friction

• polarization

Which of the items a glass rod would attract if it were rubbed with a silk cloth, giving it a positive charge.

• balloon 1

• pastic sheet 1

• balloon 2

• plastic sheet 2

Tags

NGSS.MS-PS2-3

Harper touches a negatively charged plastic rod to a rubber ball. How are the negative charges distributed on the rubber ball?

• They move to the bottom surface of the ball.

• They are evenly distributed on the inside of the ball.

• They are evenly distributed on the surface of the ball.

• They stay on the surface where the rod touches the ball.

Tags

NGSS.MS-PS2-3

Oriana touches a positively charged metal plate to a neutral metal sphere. How does the charge of the metal sphere change?

• It has an excess of positive charge.

• It has an excess of negative charge.

If a greater charge had been transferred to the leaves, which behavior would they show?

• They would angle inward to be close together or touching.

• One would hang straight outward and one would hang straight down.

• They would hang straight down again.

• They would hang farther apart.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which statement best describes why the child's hair stands up after he slides down the slide?

• Energy was transferred from the slide to the child through induction.

• Friction caused a transfer of electrons between the slide and the child, making each of his like-charged hairs repel each other.

• Energy was transferred from the child to the slide through conduction, causing the child's hair to become charged and stand up.

Tags

NGSS.MS-PS2-3

Sally Mae touches a positively charged metal plate to a neutral metal sphere. How does the charge of the metal sphere change?

• 
  It has an excess of positive charge.

• It has an excess of negative charge.

Tags

NGSS.MS-PS1-2

When a plastic rod is rubbed with a wool cloth, the wool acquires a positive charge. What is the best explanation for this effect?

• protons are transferred to the cloth

• electrons are transferred to the cloth

• electrons are transferred to the rod

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5