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by BlastRoom
Classify materials by charge motion and explain grounding in electrostatics.
#physics
40 questions
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A copper wire is used to carry charge from one end of a circuit to the other. How should copper be classified?
A rubber band is placed between a charged object and a metal table so charge will not pass easily. How should rubber be classified?
A student touches an aluminum foil strip to a charged electroscope, and charge moves through the strip. What is aluminum?
A glass rod is rubbed with silk and the charge stays mostly where the rod was rubbed. What is glass?
The dark core of a pencil is graphite, and it can complete a small lamp circuit. How should graphite be classified?
A dry wooden ruler is used as a handle for a charged metal sphere. How should dry wood be classified?
A beaker of salt water lets charge pass between two metal electrodes. How should salt water be classified?
A sample of very pure water is tested for charge flow. In this unit, how should pure water be classified?
A person touching a Van de Graaff generator finds charge spreading over the body and hair. How should the human body be classified?
A plastic comb gains static charge after being rubbed and holds the charge near the rubbed region. What is plastic?
In ordinary classroom conditions, dry air prevents charge from flowing across a small gap until a spark occurs. How is dry air classified?
An iron nail hanging from a thread swings toward a charged rod because charge shifts within the nail. How should iron be classified?
Porcelain pieces hold power lines on utility poles so that charge does not flow from the lines into the poles. How should porcelain be classified?
Electrical connectors are often coated with a thin layer of gold so charge can move easily between metal contacts. How should gold be classified?
Why does excess charge spread out over a metal sphere instead of staying at the point where it was added?
A charged plastic rod has excess charge only near the rubbed end. Which explanation best fits this observation?
A negatively charged metal sphere is connected to Earth by a copper wire and becomes neutral. What happened?
A positively charged metal sphere is grounded and becomes neutral. Which charge motion explains it?
Which statement about grounding is correct?
Why is there no electric field inside a conductor once it reaches electrostatic equilibrium?
A metal sphere is charged while sitting on a dry plastic stand. Why can it keep its charge for a while?
A positive rod is brought near a neutral metal sphere without touching it. What happens inside the sphere?
An electroscope's leaves are spread apart because it has excess charge. A student touches the metal knob while standing on the floor, and the leaves fall. Why?
Which mechanism lets salt water conduct charge even though pure water is a poor conductor?
Why are metals such as copper good conductors?
A charged metal ball touches one spot on a second neutral metal ball. What happens to charge on the second ball after contact?
A charged rubber balloon sticks to a wall, but the charge does not spread evenly over the whole balloon. Why?
A hollow metal conductor is given excess negative charge and left alone. Where is the excess charge after electrostatic equilibrium is reached?
A lightning rod is a pointed metal rod connected by a thick cable to the ground. How does this protect a building?
During a thunderstorm, why is staying inside a closed metal car safer than standing outside?
An electronics worker wears an antistatic wrist strap clipped to ground. What is the strap designed to do?
Why do many power cords have copper wires covered by plastic?
A metal appliance case is connected to the ground wire in a plug. What safety purpose does the ground wire serve?
Before fuel is pumped into a tanker truck, a metal cable connects the truck to ground. Why is this done?
Use the table. Which material is acting as an insulator in both tests?
Use the table. Which ranking goes from best conductor to poorest conductor?
Use the table. Which material should be classified as a conductor?
Use the table. Which pair of materials both allow charge to move?
Use the table. Which material allowed charge to move most freely?
Use the table. Which row best shows a material that can hold localized static charge?
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Current, Potential Difference and Resistance
50 questions
