Physics Final Chapter 16 and 17 Multiple Choice

Charge buildup between the plates of a capacitor stops when: a) there is no net charge on the plates b) unequal amount of charge accumulates on the plates c) the potential difference between the plates is equalto the applied potential difference d) the charge on both plates is the same

c

An electric field has: a) direction b) magnitude c) Both A and B

c

Coulomb's lay says that the force between any two charges depends: a) directly on the size of the charges b) inversly on the square of the distance between the charges c) both A and B d) none of the above

c

Electrical potential energy per charge is electric: a) force b) power c) potential d) work

c

The primary reason a bird can perch harmlessly on bare high voltage wires is that: a) a bird's feet are close together b) a bird has a very large electrical resistance c) there is no potential difference across the bird's feet d) all of the above

c

Which of the following units is used to state the strength of an electric field?: a) Coulombs per cubic meter b) Coulombs per newton c) Newtons per Coulomb d) meters per Coulomb

c

An electric force F exists between two objects, both having the charge q. If the charge on one object is doubled to 2q, the force between the objects becomes: a) ¼ the force b) ½ the force c) 2 times the force d) 4 times the force

c

A conductor differs from an insulator in that a conductor has: a) more protons than electrons b) faster-moving molecules c) more electrons than protons d) more electrons than an insulator e) none of the above

e

Atomic nuclei of almost all elements consist of: a) only neutrons b) protons and electrons c) neutrons and electrons d) only protons e) protons and neutrons

e

A conductor that has zero resistance at very low temperature is called a/an,: a) nonconductor b) superconductor c) semiconductor d) insulator

b

A positive ion has: a) more electrons than protons b) more protons than electrons c) a +1 charge always d) one proton

b

The SI unit of charge is the: a) ohm b) joule c) coulomb d) ampere e) newton

c

The charging of a capacitor is complete when: a) the capacitor plates have equal positive charge b) the capacitor plates have equal negative charge c) the potential difference between the capacitor plates is equal to the battery voltage d) the potential difference between the capacitor plates is equal to the 0 V

c

To say that electric charge is conserved means that no case has ever been found where: a) the total amount of charge on an object has increased b) one object has more charge than another object c) the total charge on an object has been changed d) net charge has been created or destroyed e) none of the above

d

Which of the following are examples of voltage sources?: a) battery b) generator c) computer d) both a and b

d

objects can be charged by: a) induction b) friction c) contact d) all of the above e) none of the above

d

A student rubs a certain rod with plastic wrap. The rod then repels a glass rod that has been rubbed with silk and attracts a rubber rod that has been rubbed with fur. This observation shows that the first rod has a(n) __________ charge: a) positive b) negative c) neutral d) undetermined

a

The nucleus of an atom has _____________ electric charge: a) a positive b) a negative c) a neutral d) both positive or negative

a

Two parallel plates are oppositely charged. The left plate is negative and the right plate is positive. In which direction does the electric field point? : a) to the left b) to the right

a

A difference between electrical forces and gravitational forces include: a) infinite range b) repulsive interactions c) the inverse square law d) separation distance e) none of the above

b

A repelling force occurs between two charged objects when the charges are of: a) unlike signs b) like signs c) equal magnitude d) unequal magnitude

b

A volt is a unit of: a) charge b) electric ptential c) energy d) work e) current

b

An ampere is a: a) unit of resistance b) unit of current c) type of charge d) voltage e) current

b

Electrical forces between charges are strongest when the charges are: a) far apart b) close together c) The electrical force is constant everywhere

b

Electrical potential energy is the energy a charged object has because of its: a) momentum b) location c) mass d) motion e) volume

b

Objects become electrically charged as a result of the transfer of: a) protons b) electrons c) neutrons d) nuclei

b

The charge of an electron is: a)positive b) negative c) Electrons have no charge

b

The net charge of a nonionized atom: a) depends only on the number of electrons it has b) is zero c) usually cannot be determined d) depends on the number of protons it has

b

The process of charging a conductor by bringing it near another charged object and then grounding the conductor is called: a) charging by contact b) charging by induction c) charge polarization d) neutralization

b

Two like charges a) neutralize each other b) repel each other c) must be neutrons d) attract each other e) have no effect on each other

b

What is the potential difference across a 5.0 ohms resistor that carries a current of 5.0 A?: a) 1.0x10²V b) 25V c) 10.0 V d)1.0V

b

Electric force and gravitational force are alike in that both forces: a) depend on charge b) act only when objects are touching c) depend on mass d) are field forces

d

In a good insulator, electrons are usually: a) not moving at all b) free to move around after an impurity has been added c) free to move around d) tightly bound in place e) semi-free to move around

d

Much electronic equipment contains transistors and diodes that are made from semiconductors. Semiconductors: a) can be very good insulators b) can conduct electricity c) contain helpful impurities d) all of the above e) none of the above

d

The resistance of your dry skin is usually around: a) 0.005 ohm b) 5 ohm c) 500 ohms d) 500,000 ohms e) millions of ohms

d

Which of the following does not affect a material's resistance?: a) the length of the material b) the type of material c) the temperature of the material d) Ohm's law

d

Conesrvation of charge means that: a) the total amount of charge in the universe is constant b) no experimenter has ever seen a single charge destroyed by itself c) electrons by themselves can be neither created nor destroyed d) charge can be neither created nor destroyed e) all of the above

e

Electrical resistance is measured in: a) volts b) joules c) watts d) amperes e) none of the above

e

The difference in electric potential energy and electric potential is that, : a) Electric potential energy and electric potential is due to the location of a charge b) electric potential is the speed that charge flows c) Electric potential is a measure of the energy per charge d) Both a and b e) Both a and c

e

The electric field in a certain region of space is 30 N/C. What is the force on a 2-C charge placed in that region?: a)15 N b) 2 N c) 30 N d) 4 N e) 60 N

e