physics electricity questions part 2

What do we call a material that has a resistance of zero?

superconductor

What happens when two items with negative charges come close to each other?

they repel

The electric field between the plates on a parallel plate capacitor is

uniform

Why are electrical insulators important?

used to protect us from electricity

If you double the distance away from a charged particle, the total electric field or field strength of that particle

1/4

A 0.25 μF capacitor is connected to a 9.0 V battery. What is the charge on the capacitor?

2.2x10^-6 C

Two identical metal spheres X and Y have excess charges. X has 18 excess electrons and Y has 12 excess protons. When they are joined by a metal wire, electrons will flow from X to Y,

3 excess electrons

A 0.50 μF capacitor is connected to a 12 V battery. How much electrical potential energy is stored in the capacitor?

3.6 x10^-5 J

A parallel-plate capacitor has a capacitance of C Farad. If the area of the plates is doubled while the distance between the plates is halved, the new capacitance will be

4C

What happens when a positively charged object approaches but does not touch a neutral metal object?

Electrons in the neutral object move toward the positively charged object

What happens when a positively charged object touches a neutral metal object?

Electrons transfer from the neutral object to the positively charged object

Which of the following is a good insulator?

all the above

The electric field surrounding a positively charged object is

away from

The Law of Conservation of Charge states that

charge cannot be created or destroyed

What type of materials allow electricity to flow freely?

conductors

What metal is the most commonly used conductor in electronic wiring and electronic circuits?

copper

How do electric field lines or field strength represent the magnitude of an electric field?

density of lines

A region of influence surrounding a charged object is best defined as

electric field

Compared to insulators, metals are better conductors of electricity because metals contain more loosely held or free

electrons

Objects become electrically charged as a result of the transfer of

electrons

Solid objects become electrically charged as a result of the transfer of

electrons

When a balloon is rubbed on clothes it acquires a charge by

friction

Assume a rubber rod is rubbed against a rabbit fur and gains 5 electrons. Which of the following is true?

fur lost 5 electrons

Which of the following is not a good conductor of electricity?

glass

A positive charge and a negative charge held near each other are released. As they move, the force on each particle

increases

What type of materials are resistant to the flow of electricity?

insulators

A positively charged glass rod in contact with the cap of an electroscope. As a result the gold leaves

moves apart

What two atomic particles make up the nucleus of the atom?

neutrons and protons

A conductor differs from an insulator in that a conductor ________.

none of these

Electric forces can be either attractive or repulsive. In comparison, gravitational force is

only attractive

Charge transfer between the plates of a capacitor stops when

potential difference between the plates is equal to the applied

The ________ of a material is a measurement of how well a material opposes the flow of electric current.

resistance

What element is a good electrical semiconductor?

silicon

Which of the following is the most conductive element?

silver