charges and __inversely______________ related to the ___square_________ of the separation distance.

When a proportionality becomes a formula, what must be added? a constant

What is the value for the answer above? 9 x 10⁹ Nm²/C²

3 metal spheres have charges of (sphere 1=) –12mC , (sphere 2=) +4 mC, and (sphere 3=) +3 mC. Sphere 1 touches sphere 2 leaving what charge on each sphere?
-4mC on each sphere

Sphere 2 now touches sphere 3 leaving what charges on each sphere?
-0.5mC on each sphere

If Sphere 1 is now placed at +y = 3 cm, sphere 2 at the origin, and sphere 3 at x= -2. Calculate the magnitude and direction of the NET electrostatic force on the particle at the origin.
Using the NEW charges after the touching of all the spheres!
 
The direction is below the negative x axis!

The electric field lines ___LEAVE________ a positive charge and ___ENTER________ a negative charge.

The electric field is ___DIRECTLY____________ proportional to the force and _INVERSELY____ proportional to the ____CHARGE______.

According to the statement above, what would the formula look like?

Substitute Coulomb’s Law into the formula above and show an alternate formula for electric field

What is another unit for voltage besides volts? Show this below
    V = Joules/ Coloumb

If the numerator was a symbol rather than a unit it would be?
WORK(W)
If the denominator was a symbol rather than a unit it would be?
Charge(q)
If the above concept looked like a formula it would look like?

 

Sometimes you might substitute _Kinetic__Energy______ for work, especially if the particle is moving.
 

Insert the basic formula for work into the formula above and show it below?

Insert Coulomb’s Law into the formula above and show it below.

Calculate the Electric field on the y axis due to Sphere 1at the origin

Calculate the electric field on the x axis due to sphere 3 at the origin

Calculate the magnitude of the electric field due to Sphere 1 & 3 as well as the direction at the origin
 
The direction is above the positive X axis, because electric field lines enter negative
Calculate the electric potential at the origin due to sphere 1

Calculate the electric potential at the origin due to sphere 3

Calculate the NET potential due to Sphere 1 & 3

What is the total capacitance of the circuit to the left?

How much energy is stored in this capacitor.

What is the formula for Ohm’s law?
V = IR
What does the voltage do in a series circuit? Parallel?
Individual voltages add up to the total in a series and are equal to the total in a parallel
What does the current do in a series circuit? Parallel?
Individual currents are equal to the total in a series and add up to the total in a parallel
What is the basic electrical formula for Power?
P=VI
Substitute Ohm’s law into the formula above and show me 2 alternate formulas for Power.

 

The picture above represents? A battery with internal resistance

What does the V_T represent graphically?
It is usually plotted on the y-axis

What does the ε represent graphically?
The y- intercept of the graph. It is the emf or the MAXIMUM voltage OR the voltage when the current is equal to ZERO, thus being the y-intercept.

What does the I represent graphically?
I ,or the current, is plotted on the x-axis
The maximum current occurs when the Y=0
What does “r” represent?
The "internal" resistance of the battery

What is the formula for the magnetic force on a moving particle?

According to the Right Hand Rule(RHR), do the fingers represent and include units?
The B-Field(magnetic field) in TESLAS
According to the Right Hand Rule(RHR), does the thumb represent and include units?
The velocity in m/s
According to the Right Hand Rule(RHR), does the palm represent and include units?
The force in Newtons
The left hand is used  for what type of particle? Right hand?
Right hand for proton, left hand for electron, right hand for wires and rods

 What is the unit for a magnetic field?
TESLA
When particles move into a magnetic area, the shape of their path often resembles a ?
A circle

What 2 forces are at work here?
Magnetic and centripetal
Set them equal to each other and solve for  r.

If the electrons were in a wire, would you use F = qvb? If not, what formula is appropriate?

NO!!!!

For there to be Magnetic Flux, there must be a changing ____AREA___________ ______________.

What is the formula for Magnetic Flux?

How do you find the voltage in a Rod or a coil of wire? Show me two ways!

A long, straight wire is in the same plane as a rectangular, conducting loop.  The wire carries a constant current I as shown in the figure.  Which one of the following statements is true if the wire is suddenly moved toward the loop?
Pointing thumb in the direction of current we see that the wire's magnetic field goes INTO the page where the loop is located, thus the loop's magnetic field must be OUT of the page inside the loop. Using our right hand, we place our fingers out of the page and wrap arounf the loop to discover the current goes counter-clockwise. Answer = D
 A) There will be no induced emf and no induced current.
 B) There will be an induced emf, but no induced current.
 C) There will be an induced current that is clockwise around the loop.
 D) There will be an induced current that is counterclockwise around the loop.
 E) There will be an induced electric field that is clockwise around the loop.