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Phys. II final review

Terms in this set (50)

Electric charge is
one fundamental property of matter
how does an object become electrostatic ally charged
when electrons are transferred
a coulomb is a unit of electrical
charge
a quantity of electric charge is measured in a unit called a
coulomb
which of the following is most likely to acquire an electrostatic charge
conductors and non-conductors are equally likely to acquire a charge
The SI units for electric field are
V/m
how is the magnetic field of the electric field represented by a graphic description with electric filed lines
the electric field intensity is greater when there are more lines per area
if at some point along the straight line directly between two charges the strength of the electric field at that point is found to be zero what can we say fr sure about those two charges
this charges must be like charges (both positive or both negative)
the local direction of an electric field line at any point, is said to be a tangent to the field line at that point
true
SI units for resistance
Ω (ohms)
a material is said to be ohmic if which of the following is true
if there is a constant resistance for a wide range of voltages
in this lab we are making a voltage vs. current graph. the slope of this graph will represent what
R (the resistance of the material)
which of the following relationships gives the resistance of a material
V/i
what is the theoretical resistance used in the first park of todays lab
100Ω
what is equivalent resistance of three resistors arranged in series, R1=25Ω. R2= 50Ω, R3=100Ω
175Ω
what is always true about resistors connected in parallel
they have the same potential difference (voltage) passing through each of them
what is always true about resistors connected in series
they each have the same current passing through them
what is the SI unit for current
Amps
in what way do voltage sensors and current sensors need to be connected in order to work correctly
voltage sensor in parallel, current sensor in series
the law of reflection says that the angle of incidence is always greater than the angle of reflection
false
when light moves from one medium to another the speed of light changes, this is called refraction
true
assume the speed of light in a medium is v=2x10^8 m/s and given the speed of light in a vacuum is c= 3x10^8 m/s, then the value of the index of refraction for this medium is
1.5
assume a beam of light hits a boundary separating medium 1, with index of infraction n1, and medium 2, with index of refraction n2. if the total internal reflection occurs at the boundary that separates the two mediums, then we know which of the following?
n1<n2
the index of refraction can be less than 1 for normal materials
false
the magnifications M of spherical mirror is described by which equation
M=-q/p
the principle axis of a circular mirror goes through the center of the mirror
true
in relation to the center of curvature of the mirror, where is the mirrors focal point
half way between the center of curvature and the mirror
For a Concave mirror the reflective side of the mirror is on what side of the curved surface?
on the inside of the curved surface
in todays experiment, initially how far away from the light source are you to place the miror
100cm
a thin converging lens takes the rays of light that are parallel and
converges them to a common point
what happens as your object distance increases
the image will et closer and closer in value to the focal length of the lens
in ray tracing there are three rays that are used. which ray travels through the center of the lens
the chief ray
the object distance is measured from the lens to the observer
false
which of the following algebraic expressions is equal to time constant of an RC circuit
RC
the "RC" in RC circuit stands for what
resistor and capacitor
what is the time constant of an RC circuit
the time it takes to charge a fully discharged capacitor to 63.2% of its maximum value
resonant frequency is
when the natural frequency is equal to the forced frequency
for an LRC circuit at resonance, the reactance of the inductor and capacitor cancel each other so that their impedance is equal to the resistance
true
what are the three main factors that affect the resistance of a device
length, cross section area, type of meterial
the SI units of resistivity are
Ωm
how does the cross section of the material affect its resistance
the bigger the cross area the lower the resistance
a changing magnets flux in the presence of a conductor indicates voltage in the conductor
true
the more turns of wire in a coil, the smaller the EMF produced
false
the area under a voltage vs. time graph represents? should this two areas be equal?
the change in magnetic flux; yes
the induced ____________ is proportional to the number of loops in the wire, and the rate at which the magnetic flux changes inside the loops of wire
EMF
which of the following is true regarding the junction rule
the sum of all the currents entering a junction in a circuit equals the sum of all currents leaving the junction
kirchoff's rules can be used to analyze a complex circuit when the formulas for resistors in parallel or in series becomes impractical or impossible
true
what is the loop rule
the net charge in potential around closed path is always zero
when measuring the voltage going over a particular circuit component the voltmeter must be connected how
always in parallel
when measuring the current going over a particular circuit the ammeter must be connected how
in series
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