Grade 9 Academic Science – Electricity Quiz #1. Which of the following statements is NOT part of the Law of Electric Charges? Objects with opposite charges are attracted to each other More than two objects can have charges that attract Objects with like charges repel each other
Which of the following statements is NOT part of the Law of Electric Charges?
Objects with opposite charges are attracted to each other
More than two objects can have charges that attract
Objects with like charges repel each other
None of the above
In order that the atom has a neutral charge, what is the proper configuration of the sub-atomic particles of the atom?
Number of neutrons = Number of electrons
Number of neutrons = Number of protons
Number of protons = Number of electrons
Number of protons + Number of neutrons = Number of electrons
What is “Charging of an object by contact with a CHARGED object?”
Charging by Conduction
Charging by Friction
Charging by Grounding
Charging by Induction
Copper is a good conductor. A conductor is a material that allows electrons to move through it easily.
Which subatomic particles of an atom move most easily from one material to another?
None – No subatomic particles move
When Charging by Induction, the charged object must be touching the neutral object?
Some of the time
Only if you want the charge to be temporary
In the triboelectric series, wool has a greater potential to give electrons than copper. If wool and copper are rubbed together, what charge will occur by friction on the wool?
A negative charge
A neutral charge (i.e., electrons will balance out)
A positive charge
None of the above
What is “…removing an excess charge by transferring electrons between an object and a large neutral object?”
What is an electric charge?
A form of charge, either positive or negative, that exerts an electric force
An imbalance of electric charge on the surface of an object
An object that has equal number of protons and electrons
A shift in the position of the electrons in a neutral object that occurs when a charged object is brought near it
A negatively-charged balloon is brought near a neutral conducting sphere as shown below. As it approaches, charge within the sphere will distribute itself in a very specific manner. Which one of the diagrams below properly depicts the distribution of charge in the sphere?
You want to PERMANENTLY charge the hanging ball in the picture. If you are charging by Induction, how do you ensure the ball will retain a charge permanently?
Keep the rod touching the ball permanently
Add a positive charge to the rod so both objects become neutral
Ground the ball so the electrons in the ball are pulled away leaving a positive charge
Hope and pray it happens
A conducting sphere is charged positively by some method. The charge is initially deposited on the left side of the sphere. Since the object is conductive, the charge spreads uniformly throughout the surface of the sphere. What explains the uniform distribution of the charge?
The charged atoms at the location of charge move throughout the surface of the sphere
The excess protons move from the location of charge to the rest of the sphere
Excess electrons from the rest of the sphere are attracted towards the excess protons
Okay, this just became impossible
None of the above
The transfer of electrons between two neutral objects (…made of different materials…) that occurs when they are needed rubbed together or come in conduct (touch)?
Charging by friction
Charging by induction
Charging by electric discharge
Charging by creating a h#@* of a mess
What is static electricity?
Imbalance of electric charge on the surface of an object
An object that has electrons
A form of charge exerting a force
A force of repulsion or attraction
Two neutral conducting pop cans are touching each other. A negatively-charged balloon is brought near Can X. As the balloon approaches Can X, there is a movement of electrons between the balloon and Can X (in one direction or the other). In which direction do the electrons in Can X move?
Toward the balloon
Into Can Y
The movement is actually electrons from Can Y to Can X
Into the balloon