Exam 1 Flashcards
A conductor is placed in an electric field under electrostatic conditions which of the following is true for the situation
All of the answers apply
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
Zero for both
Electrons carry a
Negative charge
The statement that the number of field lines passsing through a surface is proportional to the net charge enclosed is known as
Gauss law
A solid block of metal is placed in a uniform electric field which statement is correct concerning the electric field in the blocks interior
There is no electric field in the blocks interior
Electric field lines
Are closer together the strong the field
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
Equal to he flux of electric field through Gaussian surface B
Several electrons are placed on a hollow metal sphere they
Become uniformly distributed on the spheres outer surface
When atom a loses an electron tot atom B
Atom a becomes positive ion and atom b becomes a negative ion
The electric field at the surface of a conductor is
Perpendicular to the surface
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
Quadruples
When an electron is removed from a neutral atom it becomes
A positive ion
Which of the arrows in fig 15.2 represent the correct direction of the e field between the 2 plates
A arrow going from positive toward negative top to bottom
Which of the following makes an approximate uniform electric field
Very large, closely seperated, parallel oppositely, charged plates
The electric field shows in fig 15.3
Increases to the right
Electric dipoles always consists of two charges that are
Equal in mag and opposite in sign
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
Q1 is positive and q2 is negative the mag of q1 is greater than q2
A surface on which all points are the same potential is referred to as
An equipotential surface
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
Q/3
The dielectric constant of a vacuum is
1
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
It decreases
For an electron moving in a direction opposite to the electric field
Its potential energy decreases and its electric potential decreases
Capacitance of capacitors depends upon
All of these answers (material space and geometry)
An equipotential surface must be
Perpendicular to the electric field at any point
An equipotential surface must be
Perpendicular to the electric field at any point
A negative charge if free tries to move
From low potential to high potential
A battery charges a parallel plate capacitor fully and then is removed. The plates are immediately pulled part ………
It increases
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
Decrease
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
The potential energy of the capacitor decreases
When two or more capacitors are connected in a series to a battery
All of the given answers (carries same, totals voltage, combo is less than)
When two or more capacitors are connected in parallel to a battery
The voltage across each capacitor is the same
A voltage has been applied across a capacitor if the dielectric is replaced with another 8 times greater and voltage is reduced by half
2
Capacitors connected in a series always have blank total capacitance than any of the individual capacities
Less
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
4 or whatever number it increases by
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
If parallel Q/3 if series Q
Capacitance is E naught A/d for
Parallel plates
Fig 16-1 shows three capacitors connected to a battery what capacitor has the smallest amount of charge (if connected in series then)
All three capacitors store the same amount of charge
