All Writing quiz complete sentence questions

M(1) What Creates an electric field?

An electric field is created by electric charges.

M(1) What does an electric field do?

An electric field exerts a force on the electric charges.

M(2) If an electron is placed at rest in the gap between charged discs what direction will it move. Upward is positive direction. You must explain how to use Coulomb-Newton Law and Rule #1 to deduce the direction.

Ey(-) and electron has Q=(-), CNL = QEy = m ay, (-)(-)=ay so accel points upward.

Initial velocity is zero VI=0, Rule#1 says electron will move in direction of acceleration, upward.

M(2) a proton moves right, slows to rest over time, right is positive. Is the proton moving in the same direction as the field or traveling opposite direction? Explain using Coulomb-Newton law and Rule#1.

Proton Q=(+), Vi=(+) and proton is slowing.

Rule #1, proton is slowing so accel must point opposite Vi, (-)

Q Ex = m*ay

(+) Ex = (+) (-)

Ex = (-)

Electric field points left, proton moves opposite.

M(2) An electron moves left while electric field points right. Rightward is positive. As the electron moves through the field, is it speeding up or slowing down, use Rule#1 to tell.

Speeding up, Rule#1 says if Vi and ax have the same sign then it is speeding up.

M(2) An electron moves left while electric field points right. Rightward is positive. What direction is electron's acceleration. Use CNL to figure out.

QEx=max

(-)(+) = (+) ax

ax = (-)

points left

M(3) Electric field creates another scalar spatial property. Moving through a region of space with electric field at each point, what is the name of this scalar spatial property that changes along the direction of the electric field.

The scalar spatial property is electric potential.

M(3) When moving along the electric field direction, how does this property change?

When moving along the electric field the electric potential decreases.

M(3) Consider two parallel conducting plates containing equal charge opposite sign. What physics phenomenon represented by a scalar number exists between the two plates?

The phenomenon is called the electric potential difference between the two plates.

M(3) In a uniform E field, an electron moves left from one point to another point with lower electric potential. As it moves is it speeding up, slowing down, or constant? Use two methods (one EP diff and the other using EF direction)

Chng KE = -Q * ChngV

KE = (-)(-)(-)

KE < 0, slowing down

QEx = max

(-)(-) = ax

ax = (+), electron moves left, opposite signs means slowing down.

M(4) Consider a battery connected to a circuit. What does the battery deliver to the components in the circuit?

The battery delivers electrical energy to the circuit.

M(4) A resistor is added, what does the resistor do with what the battery delivers?

The resistor transforms the energy into other types of energy.

M(4) Write one or two complete sentences describingwhat happens to the lightbulb shown in the figure to the rightafter the switch is closed. Assume the capacitor has largecapacitance and is initially uncharged, and assume that thelight illuminates when connected directly across the batteryterminals.

When the switch is closed, the capacitor will begin to charge causing the lightbulb to light up. As the capacitor charges, the current will decrease causing the light to dim.

M(5) What creates a mag field?

Current creates a mag field.

M(5) what does a mag field do?

A mag field exerts a lorentz force on a moving charge and current.

M(5) can a constant mag field set into motion an electron at rest? Explain why or why not.

No, a mag field only exerts a lorentz force on a moving charge. No velocity means no force.

M(5) Can a constant mag field slow down an electron until stop?

No because a mag field acts perpendicular to velocity. This can change direction but not speed.

M(6) What two fundamental sources create electric fields and their associated electric potential differences?

A changing mag field and charge create an electric field.

M(7) An LC-circuit is often described as an oscillating circuit. What oscillates in this circuit?

The charge is oscillating in the circuit.

M(7) What oscillates in an electromagnetic wave (such as a radio wave) as it propagates through space?

It is the electric and magnetic field that oscillates.

M(7) What do electromagnetic waves transport?

Electromagnetic waves transport energy.

M(7) What does a radio wave do to charges in the receiving antenna to provide a signal for your car radio?

The radiowaves make the electrons vibrate in the antenna.

M(7) What property shared by a radio wave and your radio's LC-circuit must match to produce the largest signal for ur car radio?

The frequency of the radiowaves must match the natural frequency of the LC-Circuit

M(7) What is the vocabulary word used to describe when the properties in question (e) match?

The vocabulary term is resonance.