Physics 115 Lab Quizes

An electron moving in the +x direction eneters a magnetic field. IF the electron experiences a magnetic deflection in the -y direnction, the magnitude field in this region points in the :

-z direction

Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. Which of the following choices best describes the charge of the three particles?

1 is negative, 2 is neuetral, and 3 is pos

The typical radius of an atom is closer to:

10^-15 m

Which of the following choices best represents the likely "byproducts" when accelerated electrons collide with air molecules?

A photon

Which of the following statements is correct?

A photon has no charge

Three 10-ohm that are made from the same material are connected in series. Which of the following quantities are the same for these three?

All of these on the list: current, voltage, resisitivity

The size of the VDG dome determines

All of these on the list: how much charge is stored, how long sparks can reach, electric potential magnitude

Two resistors in parallel are made of the same material and have the same length and cross section. These two resistors will always have there same

All of these on the list: voltage, resistance, current, and resisivity

Which of the following statements can be described by the ideal gas law?

All of these statements: forces exerted, how fast gas, momentum exchange

Which of the following quantities does the breakdown voltage of gas depend on?

All of these: Density, Temperature, Partial pressure

Consider the equation PV = constant. What of the following choices can be implied from the equation

All of these: dP = 0, dT = 0

Which domain does the creation of an electromagnet require?

Both AC and DC domains would work?

In your lab, you deduced that the speed of the capacitor discharging in a DC circuit dependent on which of the following quantities?

Both on capacitance and resistance

The plates of an isolated parallel plate capacitor with a capacitance C carry a charge Q. What is the capacitance of the capacitor if the charge is increae to 2Q?

C

An electrostatic luminous spark is a result of which of the following?

Collisions between ions or electrons and air molecules

Three 10-Ohm resistors that are made from the same material are connected in series. Which of the following quantities will always be the same for the three resistors?

Current, voltage, and resistivity

A student argues that the light that is produced during the VDG spark is due to the thermal expansion of the surrounding air. This statement is

False

Both Kirchoff rules are not valid for AC current.. This statement is:

False

Is the statement "Ohm's law is always obeyed across all electronic devices" true or false

False

One argues that because the proton is much larger in mass than the electron, it creates a much stronger electric-filed at the same distance than the electron does. This statement is:

False

The charges generated by the VDG are because of

Frictional forces

Is the relative mean square quantity for electric potential in AC always greater than or less than the numerical average of the AC electric potential

Greater than

The basic function of an oscilloscope is to return the electric potential difference across any element in a circuit with respect to which of the followiing?

Ground

Two beakers contain two liquids of the same mass. We heat them to the same final temperature, without any phase changes occurring. The liquid that heats faster has

It has a smaller specific heat than the other

Which of the following transformers, if any, did you use in this lab?

Neither of these: step up, step down

The sound from the electrostatic luminous spark we observed in the lab is a result of

None of these on the list: photons produced from excited atoms, electron production, electron reduction

Which of the following materials can be used to construct a Faraday cage?

None of these: insulator, non-conductor, semi-conductor

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

R/squar(2)

Two resistors R1 and R2 are run in parallel AC circuit but R1 get's hotter faster than R2. Then it would be safe to assume that

R2 > R1

Inductive charging is due to which of the following?

The Coulomb force

The inductive charging (i.e. the reason why we used the smaller dome in the lab) acquires the opposite charge than the main VDG dome is because

The repelling forces between electrons

The phase difference between the AC voltages of two resisters in series dependent on which of the following?

There is no phase difference between

When do charges reside on a randomly-shaped conductor?

They always reside at the surface

During your Boyle's law experiment, why did you wait for a few seconds each time before you pressed down the syringe

To make sure that the process is isothermal

The elapsed time we considered in order to find the liquid with the higher specific heat DID play a role. Based on your observations this argument is

True

In your lab experiment, you considered a capacitor and resistor in sereis in AC domain. Did the time-series of the voltage across the capacitor ever become zero?

Yes

The transformer is a device than can increase the output of the input electric energy. This statement is:

absurb

At its natural state, air is

an electrical insulator

In your lab experiment, you deduced that as the AC source frequency increae in an RC in series, and the rms voltage across the resistor approached which of the following values?

approaches the rms of the source

Two capacitors are connected in series have the same charge density and same plate separation. Which of the following quantities will always be the same for these two capacitors?

charge

Two current-carrying wires can indeed exhibit attrictive force. This statement is:

correct

In an AC domain, the time-series of the voltages between the capacitor and the resistor will always be:

exactly 90

The resistance of the semi-conductor we studied in the lab

exhibited non-Ohmic behaviour

A charged particle is moving with speed v perpendicular to a uniform magnetic field. A second identical charged particle is moving with speed 2v perpendicular to the smae magnetic field. If the frequecny of revolution of the first particle is f, the fre

f

A tranfromer is a way to increae the electrical energy from one coil to the adjacent coil

false

Faraday's law only applies to material that are paramegnetic such as iron

false

In the original Newton's law of cooling, the type of liquid is utterly irrelevant. This is:

false

Ohm's law is always obeyed across all electronic devices. This statement is:

false

Someones argues that a transformer, in fact increases the electric potential energy of the outer coil. This person's arguement is blatany

false

The neutron is much less massive than the proton. This statement is:

false

The Joule's law of heating suggests a linear relationship between temperature and time. What we actually observed was

far from a straight line

Like capacitors and resistance in an AC domain, inductance is a property of which of the following quantities?

geometry

Which of the follwoing quantities is the capacitance dependent on>

geometry and dielectric only

The RMS quantity for electric potential in AC is ALWAYS

greater than the numerical average of the AC electric potential

The basic function of an oscilloscope is to return the electric potential difference across any elemt in a curcuit with respect to which of the following

ground

Inside a Faraday cage the electric field:

is zero

The term PV in the ideal gas law has units of:

joule

The specific heat of two different liquids at the same temperature and pressure are:

likely different

In your DC experiment, when the capacitor was just beginning to charge the current was:

max

We saw that the temperature probe near the bottom of the canister containing our piquid exhibited"

more time variations

Two different resistors in series connected to an AC supply will always exhibit:

no voltage phase difference

The EMF field, unlike the Coulumb

non-conservative

In an AC domain, the time-series of the voltages between the capacitor and the entire circuit will always be:

none of these

On which of the following parameters does the heat contained within an ideal gas depend?

none of these apply

on which of the following parameters does the heat contained within an ideal gas law depend?

none of these on the list

Which of the follwoing will cause the capacitance to increase:

none of these: increae the plate seperatation, decreae the charge on the plates, increase the voltage across the capacitor

The charges on the VDG reside:

on the surface

In the lab we experimented on resistors in the AC domain. When we increased the frequency without changing anything else, we observed that the current of the circuit:

remained the same

In your lab experiment, you deduced that as the AC source frequecny increases in an RC in parallel, then the rms voltage across the entire circuit:

remains the same

Whe Ohm's law is applied to two coils in series, the equivalent inductance is treated in the same way as which of the follwoing circuit components?

resistors

A charge is accelerated from rest through a potential difference V and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of radius R. If the accelerating potential is tripled to 3V, what will be the radius of the circular arc?

squareroot of (3) * R

When lowering the frequency in an AC LR circuit then the inductance

stays the same

One of the major difference between DC and AC is that when the circuit includes a capacitor and a resistor in series, then:

the capacitance reactance depends on frequency

One of the major differences between DC and AC that when the circuit includes a capacitor is that:

the capacitor has resistance, but dependent on frequency

A coil is in series with a resistor and an AC source. We turn on the power . What occurs the moment the current is tryiing to enter the coil?

the inductor will produce a magnetic field which will further indice a current with direction opposite to the current in the circuit

Heat is a form of energy that relates to:

the nergy flow from hot to cold

In your lab, you observed that the discharging capacitor would exhibit:

the opposite polarity than it was charged at

Which of the following methods did we use to ensure the simulation of an adiabatic decompression in our experiment?

the process was fast

From our experiment heating oit and water, we deduced that the speed at which each liquid heats up can alse be dependent on the:

the size of the molecules of the liquid

Gauss' law for magnetism essentailly describes that:

there are no magnetic monopoles

Only an electromagnet can have a north magnetic pole without having a south magnetic pole. This statement is

totally inaccurate

A verticle wire carries a current vertically upward in a region where the magnetic field vector points toward the north. What is the direction of the magnetic force on this current-carrying wire due to the magnetic field

toward the west

An electron, moving toward the west, enters a uniform magnetic field. Because this field the electron curves upward. The direction of the magnetic field s:

towards the north

At any given time there are electrons on the air that we breathe. This statement is:

true

Momentim exchange between electrons is one the parameters that determines the resisitivy of a wire. This statement is:

true

Momentum exchange between electron electrons is one of the parameters that determines the resisivity of a wire. This is because

true

Ohm's law in AC and DC domain treats an equivalent resistor (i.e. combining more than one resistors into one) the exact same way. This statement is

true

Ohm's law in Ac and DC domain treats the equivalent resistance the exact same way:

true

Someone argues that denser liquids must also have higher specific heat. Solely based in your experiments results, this is likely

true

Someone argues that we can freeze a liquid if we apply extrem pressire on it> This arguement is:

true

The electron is less massive than the proton. This statement is:

true

An RL circuit is connected to a constant DC voltage input of +5 V. When we turn on the power, then at that instant the potential across the inductor will be

will be -5V

In this lab, you learned that if a coil is connected to a DC source, the moment we turn on the switch the current going through the coil will be

zero

The electric field at the center of the VDG dome is

zero

An adiabatic process exchanges:

zero heat with the environment