H Physics Electricity Test

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is doubled, then the repulsive force would be

0.0800 N

Object A is charged by contact using a negatively charged object. Object A is

Negative

Resistance

The hindrance to the flow of charge

If object A attracts object B with an electric force, then the attractive force must be mutual - i.e., object B also attracts object A with the same force.

True

Electric Field

a field of force surrounding a charged particle

protons and neutrons can move

false

Ohm's Law

the strength of a direct current is directly proportional to the potential difference and inversely proportional to the resistance of the circuit. I=V/R

A negatively charged object has gained electrons

true

Opposite charges attract

true

like charges repel

true

charging by friction

two objects rub together and one becomes positively charged and the other becomes negatively charged

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is halved, then the repulsive force would be

1.28 N

Voltage

Energy per unit. Pushes the charges.

A doubling of the separation distance between two point charges results in a quadrupling of the electric force.

False

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge Object A by the method of contact. Object A is

Negative

If an object has the electric field vector directed inwards it is

Negative

If you comb your hair and the comb becomes positively charged, then your hair becomes _______.

Negative

Object A is charged by induction using a positively charged object. Object A is

Negative

Current

The flow of electric charge in a circuit. A coulomb of charge per second.

Electrons are the mobile charge carriers in an electric circuit.

True

At a location of 0.200 m from object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured at a location of 1.00 m from object A, then the field strength would be

0.00200 N/C

At a location of 0.200 m from object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured at a location of 0.400 m from object A, then the field strength would be

0.0125 N/C

At a location of 0.200 m from object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured using a test charge with twice the charge at a location of 0.200 m from object A, then the field strength would be

0.0500 N/C

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is is increased by a factor of 3 and the charge on both of the balloons is doubled, then the repulsive force would be

0.142 N

At a location of 0.200 m from object A, the electric field strength is 0.0500 N/C. If the electric field strength were measured using a test charge with twice the charge at a location of 0.100 m from object A, then the field strength would be

0.200 N/C

At a separation distance of 0.500-m, two like-charged balloons experience a repulsive force of 0.320 N. If the distance is is decreased by a factor of 3 and the charge on one of the balloons is doubled, then the repulsive force would be

5.76 N

Parallel Circuit

A circuit that contains more than one path for current flow.

Conductor

A material that allows heat and electricity to pass through it.

Series Circuit

An electric circuit with a single path

Atom

Basic unit of matter

Which of the following charging methods result in charging an object opposite to the charge on the object used to charge it?

Charging by friction and induction.

Which of the following charging methods work without ever touching the object to be charged to the object used to charge it?

Charging by induction

A battery is used to power a flashlight circuit. When the battery no longer works, it is because it has run out of charge

False

A tripling of the separation distance between two point charges results in an electric force which is one-sixth of the original value.

False

As the distance from Object A is doubled, the electric field strength created by object A increases by a factor of 4.

False

Charge is consumed as it moves through the energy-transforming devices of the external circuit. For instance, the amount of charge entering a light bulb in a second is less than that which exits the light bulb in a second.

False

Electric Force is a contact force.

False

Electric forces between two charged objects increases with increasing separation distance.

False

Electric forces can only act between charged objects - either like-charged or oppositely-charged.

False

In an electric circuit of an automobile, the 12-Volt car battery is sometimes referred to as the internal circuit because it is located inside of the hood of the car.

False

Object B is used to test the electric field strength about Object A; as the separation distance between Object A and Object B is doubled, the force which it experiences decreases by a factor of 4 but the electric field strength remains the same.

False

The electric field strength created by object A is dependent upon the charge of the test object used to measure the strength of the field.

False

The path of charge flow from the + to the - terminal of the circuit can consist of nonconductive material.

False

Which of the following charging methods can result in charging an object with a negative charge?

Friction, conduction, and induction

Connor Duct (Con to his friends) takes a positively charged rubber rod and touches a metal sphere on an insulated stand as shown at the right. Draw the direction of electron flow. What is the final charge of the sphere

From the sphere into the rod. Positive

Object A is used to charge an aluminum plate by the method of induction. The aluminum plate acquires a positive charge. Object A is

Negative

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge Object A by the method of induction. Object A is

Positive

A rubber rod has a greater electron affinity than animal fur. The rubber rod is charged by friction with animal fur. The rubber rod is then used to charge an aluminum pop can by the process of induction. The pop can is then contacted to object A. Object A is

Positive

If an object attracts neutral paper bits and attracts a negatively-charged balloon

Positive

If an object has the electric field vector directed outwards it is

Positive

If an object repels a balloon (balloon E) which is repelled by a positively-charged balloon (balloon F) it is.

Positive

Object A is charged by friction using animal fur. Animal fur has a greater electron affinity than object A. Object A is

Positive

Object A is used to charge an aluminum plate by the method of induction. The aluminum plate acquires a negative charge. Object A is

Positive

If an object which attracts a balloon (balloon C) which is repelled by a negatively-charged balloon (balloon D) it is

Positive or neutral

A doubling of the quantity of charge on one of the objects results in a doubling of the electric force.

True

As the charge of Object A is doubled and the distance from object A is doubled, the electric field strength created by object A decreases by a factor of 2.

True

As the charge of Object A is doubled, the electric field strength created by object A increases by a factor of 2.

True

Charge is supplied with energy in the internal circuit and the energy is transformed into other forms in the external circuit.

True

Electric fields are directed inwards in regions around negatively-charged objects and outwards in regions around positively-charged objects.

True

Electric forces between two charged objects increases with increasing quantity of charge on the objects.

True

For irregularly shaped objects, the electric field strength is greatest around points of highest curvature.

True

Object B is used to test the electric field strength about Object A; as the charge of Object B is doubled, the force which it experiences is doubled but the electric field strength remains the same.

True

The electric field is a vector which points in the direction which a positive test charge would be accelerated.

True

The electric field strength about charged Object A is the force per charge experienced by a test charge placed at some location about Object A.

True

The electric field strength created by object A is dependent upon the charge on object A.

True

The electric field strength created by object A is dependent upon the separation distance from object A.

True

The electric field strength inside of a closed conducting object (e.g., inside the sphere of the Van de Graaff generator) is zero.

True

The location on an electric circuit where the charge possesses the greatest amount of electric potential energy is the + terminal of the battery.

True

Units on electric field are Newtons/Coulomb (N/C).

True

Connor Duct (Con to his friends) takes a positively charged rubber rod and touches a metal sphere on an insulated stand. The sphere acquires this charge because ____.

electrons move from the sphere to the rubber rod

A tripling of the quantity of charge on both of the objects results in an increase in the electric force by a factor of 6.

false

Charge carriers in a metal are electrons rather than protons. This is due to the fact that electrons are __________.

loosely bound

Negative Charge

more electrons than protons

Positive Charge

more protons than electrons

if a formerly neutral object that just gained some electrons it is

negative

if an object attracts neutral attracts paper bits and repels a negatively-charged balloon it is

negative

Electron

negatively charged particle

If an object attracts a negatively-charged balloon and attracts a positively-charged balloon it is

neutral

if a formerly neutral object that just lost some electrons it is

positive

if an object possesses more protons than electrons it is

positive

if an object attracts a negatively-charged balloon it is

positive or neutral

If an object attracts a charged balloon (balloon A) which is attracted to a negatively-charged balloon (balloon B) it is

positive, negative, or neutral

if an object possesses more neutrons than electrons it is

positive, negative, or neutral

Proton

positively charged particle

Potential Difference

the difference of electrical potential between two points.

Power

the rate at which work is done

charging by induction

the rearrangement of electrons on a neutral object caused by a nearby charged object

charging by conduction (contact)

type of charging where charge is transferred from a charged object to an uncharged object by touching them together