Physics

A conducting sphere has a net charge of –6.4 × 10^–17C. What is the approximate number of excess electrons on the sphere?

• 100

• 200

• 300

• 400

Tags

NGSS.HS-PS3-5

Complete the following statement: When an ebonite rod is rubbed with animal fur, the rod becomes negatively charged as ___________.

• positive charges are transferred from the fur to the rod.

• negative charges are transferred from the rod to the fur.

• negative charges are created on the surface of the rod.

• negative charges are transferred from the fur to the rod.

Tags

NGSS.HS-PS3-5

Which one of the following statements is true concerning the magnitude of the electric field at a point in space?

• It is a measure of the total charge on the object.

• It is a measure of the electric force per unit charge on a test charge.

• It is a measure of the electric force per unit mass on a test charge.

• It is a measure of the ratio of the charge on an object to its mass.

Tags

NGSS.HS-PS2-4

An electron traveling horizontally enters a region where a uniform electric field is directed upward. What is the direction of the force exerted on the electron once it has entered the field?

• to the left

• to the right

• upward

• downward

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which one of the following statements is true concerning the strength of the electric field between two oppositely charged parallel plates?

• It is zero midway between the plates.

• It is constant between the plates except near the edges.

• It is a maximum near the positively charged plate.

• It is a maximum near the negatively charged plate.

Tags

NGSS.HS-PS3-5

Which of the following is TRUE about electric charge?

• It can be lost.

• It can be destroyed.

• It can be transferred from atom to atom.

• It is created from a chemical reaction.

Which of the following is the most effective conductor?

• iron

• water

• wood

• oil

Tags

NGSS.MS-PS3-3

What is the direction of the electric field at the test point on the -x-axis, 50 cm from the charge q = +5.00nC which is located at the origin?

• eastward

• westward

• northward

• southward

Tags

NGSS.HS-PS2-4

An electron traveling horizontally from North to South enters a region where a uniform electric field is directed downward. What is the direction of the electric force exerted on the electron once it has entered the field?

• to the east

• to the west

• upward

• downward

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-5

Of the following quantities, the one that is not a scalar in character is ______

• charge

• electric field

• energy

• electric potential