Electrostatic

Glass is a very good electrical insulator. How is then possible that a glass rod can be charged by rubbing it with cloth?

Because the rod is an insulator, the charge that is transferred to the surface of the rod has difficulty moving.

Which one of the following statements concerning electrical conductors is false?

FALSE: a. Rubber is an excellent electrical conductor. TRUE: b. Most metals are very good electrical conductors. c. When a positively-charged object is moved into contact with an electrical conductor, electrons move toward the object. d. A material that is a good electrical conductor has many free electrons that can easily move around inside the material.

Which of the following statements concerning the electric field is false?

FALSE: b. The SI unit of the electric field is the newton per meter (N/m) TRUE: a. If a positively-charged particle is placed at a location where the electric field is directed due north, it will be accelerated due north. c. The magnitude of the electric field at a particular location due to a particular charged particle is inversely proportional to the square distance of the particle from that location. d. At a given point, a charged particle will experience a force, if an electric field is present at that location. e. The electric field is a vector quantity.

Which one of the following statements concerning the electric force is true?

TRUE: a. It is possible for a small negatively-charged particle to float above a negatively charged surface. FALSE: b. The electric force cannot alter the motion of an object. c. A positively-charged object is attracted toward another positively-charged object. d. Newton's third law of motion does not apply to the electrostatic force. e. Two charged objects with identical charges will exert an attractive force on one another.

A conductor that is initially electrically neutral is touched by a rod that has a net positive charge. Which of the following statements describing the conductor after the rod is removed is true?

The conductor will have a net positive charge.

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

a. Upward

Complete the following statement: Electric field lines show:

a. the direction of the electric field. b. the strength of the electric field. c. the force exerted on a test charge.

Complete the following sentence: When animal fur is rubbed with a piece of amber,

b. The amber becomes negatively charged and the fur becomes positively charged.

The direction of the electric field is the same as which of the following properties related to a test charge?

c. force on a positive test charge

Which one of the following values is the smallest possible amount of free charge that has been discovered?

d. 1.60 * 10^-19 coulombs

A positively-charged object is released from rest in a region containing a uniform electric field. Which one of the following statements concerning the subsequent motion of the object is correct?

d. The object will experience a constant acceleration and move in the direction of the electric field.

Complete the following sentence: an electric insulator has

few electrons available to conduct electricity, so it is a poor conductor.

Which of the following terms is used to describe a material that does not allow electrons to easily move through it?

insulator

Which one of the following rules, laws, or principles describes how the net electric charge of an isolated system undergoing any process remains constant?

law of conservation of electric charge

Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as

negative charges are transferred from the rod to the silk.

If you scuff electrons onto your shoes while walking across a rug, are you negatively or positively charged?

negatively

An initially electrically neutral conducting sphere is placed on an insulating stand. A negatively-charged glass rod is brought near, but does not touch the sphere. Without moving the rod, a wire is then attached to the sphere that connects it to earth ground. The rod and wire are then removed simultaneously. What is the final charge on the sphere?

positive