PHYS 2109 Pre & Post-lab Quizzes With
Complete Solutions
The north end of a compass in the Earth's magnetic field points toward the
geomagnetic ____________ pole, which is located near the Earth's geographic
_____________ pole.
PrL1 - ANSWER South
North
The south end of a compass in the Earth's magnetic field points toward the
geomagnetic ___________ pole, which is located near the Earth's geographic
_________ pole.
PrL1 - ANSWER North
South
What instruments will you be using in lab? (Select all that apply.)
PrL1 - ANSWER a. compass
b. magnets
You will investigate the magnetic field due to which of the following? (Select all
that apply.)
PrL1 - ANSWER a. configurations with a single bar magnet
b. configurations with 2 bar magnets
c. a coil of current-carrying wire
Magnetic field lines always point in which direction? (Select all that apply.)
PrL1 - ANSWER a. toward magnetic south poles
d. away from magnetic north poles
Recall the observed behavior of the compass during the mapping of the
magnetic field. Which descriptions best match the observed behavior?
PsL1 - ANSWER c. where the field is weak the compass needle slowly oscillates
around the final equilibrium
e. where the field is strong the compass needle readily & quickly aligns with
rapid oscillations around the equilibrium direction
Which of the following best describes the relationship between how closely
spaced the field lines are and the strength of the magnetic field?
PsL1 - ANSWER c. where the lines are closely packaged together
d. where the lines are widely separated the field is weak
, Recall the behavior of the compass needle as you explored the magnetic field
created by the coil. Which statements are true?
PsL1 - ANSWER a. If I always move in the direction indicated by the compass
needle, thus following a given field line, my path will trace a loop going through
the inside of the coil and returning to my point of departure.
b. As the compass enters one end of the coil, the needle aligns with the axis of
the coil and its orientation does not change as you move the compass along the
interior of the coil and exit at the other end.
It is OK to turn the power on to the circuit before my TA checks it.
PrL2 - ANSWER false
What are the units of current?
PrL2 - ANSWER amperes or amps which is the rate of flow.
What are the units of potential difference?
PrL2 - ANSWER volts
What are the units of resistance?
PrL2 - ANSWER ohms
When making a graph, data plotted on the y axis should be the _____ variable.
PrL2 - ANSWER dependent
When making a graph, data plotted on the x axis should be the _______ variable.
PrL2 - ANSWER independent
According to Ohm's Law, if you create a graph of current (I) vs potential
difference (V), you would expect a ______ relationship.
PrL2 - ANSWER linear
Which of the following will you be directly measuring? (Select all that apply.)
a. current
b. voltage
c. resistance
PrL2 - ANSWER current & voltage
If you made a plot of current versus voltage and calculated a slope of (0.002857
± 0.0003265) A/V. What is the value of R assuming the data were plotted in MKS
units?
PsL2 - ANSWER R = 350.018 +/- 40 ohms
If you calculated 106+/- 1 ohms and the manufacturer says it is 100 ohms with a
5% tolerance, do your data support the manufacturer's claims?
PsL2 - ANSWER yes
Complete Solutions
The north end of a compass in the Earth's magnetic field points toward the
geomagnetic ____________ pole, which is located near the Earth's geographic
_____________ pole.
PrL1 - ANSWER South
North
The south end of a compass in the Earth's magnetic field points toward the
geomagnetic ___________ pole, which is located near the Earth's geographic
_________ pole.
PrL1 - ANSWER North
South
What instruments will you be using in lab? (Select all that apply.)
PrL1 - ANSWER a. compass
b. magnets
You will investigate the magnetic field due to which of the following? (Select all
that apply.)
PrL1 - ANSWER a. configurations with a single bar magnet
b. configurations with 2 bar magnets
c. a coil of current-carrying wire
Magnetic field lines always point in which direction? (Select all that apply.)
PrL1 - ANSWER a. toward magnetic south poles
d. away from magnetic north poles
Recall the observed behavior of the compass during the mapping of the
magnetic field. Which descriptions best match the observed behavior?
PsL1 - ANSWER c. where the field is weak the compass needle slowly oscillates
around the final equilibrium
e. where the field is strong the compass needle readily & quickly aligns with
rapid oscillations around the equilibrium direction
Which of the following best describes the relationship between how closely
spaced the field lines are and the strength of the magnetic field?
PsL1 - ANSWER c. where the lines are closely packaged together
d. where the lines are widely separated the field is weak
, Recall the behavior of the compass needle as you explored the magnetic field
created by the coil. Which statements are true?
PsL1 - ANSWER a. If I always move in the direction indicated by the compass
needle, thus following a given field line, my path will trace a loop going through
the inside of the coil and returning to my point of departure.
b. As the compass enters one end of the coil, the needle aligns with the axis of
the coil and its orientation does not change as you move the compass along the
interior of the coil and exit at the other end.
It is OK to turn the power on to the circuit before my TA checks it.
PrL2 - ANSWER false
What are the units of current?
PrL2 - ANSWER amperes or amps which is the rate of flow.
What are the units of potential difference?
PrL2 - ANSWER volts
What are the units of resistance?
PrL2 - ANSWER ohms
When making a graph, data plotted on the y axis should be the _____ variable.
PrL2 - ANSWER dependent
When making a graph, data plotted on the x axis should be the _______ variable.
PrL2 - ANSWER independent
According to Ohm's Law, if you create a graph of current (I) vs potential
difference (V), you would expect a ______ relationship.
PrL2 - ANSWER linear
Which of the following will you be directly measuring? (Select all that apply.)
a. current
b. voltage
c. resistance
PrL2 - ANSWER current & voltage
If you made a plot of current versus voltage and calculated a slope of (0.002857
± 0.0003265) A/V. What is the value of R assuming the data were plotted in MKS
units?
PsL2 - ANSWER R = 350.018 +/- 40 ohms
If you calculated 106+/- 1 ohms and the manufacturer says it is 100 ohms with a
5% tolerance, do your data support the manufacturer's claims?
PsL2 - ANSWER yes
