Exam 1

Question 1

A conductor is placed in an electric field under electrostatic conditions which of the following is true for the situation

Answer 1

All of the answers apply

Question 2

If a solid metal sphere and a hollow metal sphere of equal diameters are each give the same charge the e field midway between the sphere center and the surface is

Answer 2

Zero for both

Question 3

Electrons carry a

Answer 3

Negative charge

Question 4

The statement that the number of field lines passsing through a surface is proportional to the net charge enclosed is known as

Answer 4

Gauss law

Question 5

A solid block of metal is placed in a uniform electric field which statement is correct concerning the electric field in the blocks interior

Answer 5

There is no electric field in the blocks interior

Question 6

Electric field lines

Answer 6

Are closer together the strong the field

Question 7

Gaussian surfaces a and b enclose the same positive charge +Q the area of the Gaussian surface a is 3 times larger than that of surface b the flux of electric field through surface a is

Answer 7

Equal to he flux of electric field through Gaussian surface B

Question 8

Several electrons are placed on a hollow metal sphere they

Answer 8

Become uniformly distributed on the spheres outer surface

Question 9

When atom a loses an electron tot atom B

Answer 9

Atom a becomes positive ion and atom b becomes a negative ion

Question 10

The electric field at the surface of a conductor is

Answer 10

Perpendicular to the surface

Question 11

Two charged objects attract each other with a certain force if the charges on both objects are doubled with no change in separation the forces between them

Answer 11

Quadruples

Question 12

When an electron is removed from a neutral atom it becomes

Answer 12

A positive ion

Question 13

Which of the arrows in fig 15.2 represent the correct direction of the e field between the 2 plates

Answer 13

A arrow going from positive toward negative top to bottom

Question 14

Which of the following makes an approximate uniform electric field

Answer 14

Very large, closely seperated, parallel oppositely, charged plates

Question 15

The electric field shows in fig 15.3

Answer 15

Increases to the right

Question 16

Electric dipoles always consists of two charges that are

Answer 16

Equal in mag and opposite in sign

Question 17

Two stationary point charges q1 and q2 are shown in fig 15.4 the sketch along with some electric field lines representing the field between them what can you find from the sketch

Answer 17

Q1 is positive and q2 is negative the mag of q1 is greater than q2

Question 18

A surface on which all points are the same potential is referred to as

Answer 18

An equipotential surface

Question 19

THREE identical capacitors are connected n parallel to a battery if a total charge Q flows from he battery how much charge does the capacitor carry

Answer 19

Q/3

Question 20

The dielectric constant of a vacuum is

Answer 20

1

Question 21

The plates of a parallel plate capacitor are maintained with constant voltage by a battery as they are pulled apart what happens to the strength of the electric field during the process

Answer 21

It decreases

Question 22

For an electron moving in a direction opposite to the electric field

Answer 22

Its potential energy decreases and its electric potential decreases

Question 23

Capacitance of capacitors depends upon

Answer 23

All of these answers (material space and geometry)

Question 24

An equipotential surface must be

Answer 24

Perpendicular to the electric field at any point

Question 25

An equipotential surface must be

Answer 25

Perpendicular to the electric field at any point

Question 26

A negative charge if free tries to move

Answer 26

From low potential to high potential

Question 27

A battery charges a parallel plate capacitor fully and then is removed. The plates are immediately pulled part ………

Answer 27

It increases

Question 28

The plates of a parallel plate capacitor are maintained with constant voltage by a battery as they are pulled apart. During this process the amount of charge on the plates must

Answer 28

Decrease

Question 29

A dielectric is inserted between the plates of an isolated parallel plate capacitor that Carrie’s a charge Q what happens to the potential energy stored in the capacitor

Answer 29

The potential energy of the capacitor decreases

Question 30

When two or more capacitors are connected in a series to a battery

Answer 30

All of the given answers (carries same, totals voltage, combo is less than)

Question 31

When two or more capacitors are connected in parallel to a battery

Answer 31

The voltage across each capacitor is the same

Question 32

A voltage has been applied across a capacitor if the dielectric is replaced with another 8 times greater and voltage is reduced by half

Answer 32

2

Question 33

Capacitors connected in a series always have blank total capacitance than any of the individual capacities

Answer 33

Less

Question 34

When a die3lectric material is introduced between he plates of a parallel plate capacitor the capacitance increases by a factor of 4 what is the dielectric Constance of the material introduced

Answer 34

4 or whatever number it increases by

Question 35

Three identical batteries are connected in (series) or (parallel) to a battery if a total charge q flows from the batter how much charge does capacitor carry

Answer 35

If parallel Q/3 if series Q

Question 36

Capacitance is E naught A/d for

Answer 36

Parallel plates

Question 37

Fig 16-1 shows three capacitors connected to a battery what capacitor has the smallest amount of charge (if connected in series then)

Answer 37

All three capacitors store the same amount of charge