Coulomb's law electric field charge on y axis

In summary, at position x = a, the electric field due to the +2q charge is greater than the electric field due to the two -q charges.
  • #1
kirby2
43
0
Is this question worded poorly or is it just me?

Three charges are on the y-axis. Charges -q are at y = ±d and charge + 2q is at y = 0.
(a) Determine the electric field E along the x-axis.
(b) Verify that your answers to part a has the expected behavior as x
becomes very small and very large.

what i don't get is that the charge on y=0 can be anywhere on the x-axis so i don't know how to get the field on the x-axis when i can place that charge anywhere. can someone verify if this question is legit?
 
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  • #2
kirby2 said:
Is this question worded poorly or is it just me?

Three charges are on the y-axis. Charges -q are at y = ±d and charge + 2q is at y = 0.
(a) Determine the electric field E along the x-axis.
(b) Verify that your answers to part a has the expected behavior as x
becomes very small and very large.

what i don't get is that the charge on y=0 can be anywhere on the x-axis so i don't know how to get the field on the x-axis when i can place that charge anywhere. can someone verify if this question is legit?
All three charges are along the y-axis.

The +2q charge also lies on the x-axis.

That places it at a very specific location.
 
  • #3
you said "All three charges are along the y-axis.

The +2q charge also lies on the x-axis." why did you say "also"?
 
  • #4
kirby2 said:
you said "All three charges are along the y-axis.

The +2q charge also lies on the x-axis." why did you say "also"?

Because you said in your original post:
"what i don't get is that the charge on y=0 can be anywhere on the x-axis ..."​
This indicated to me that you must have thought that the +2q charge, the on at y = 0, could be anywhere on the x-axis.
 
  • #5
(3,0) and (0,0) are both at y=0 yet they are in two different places.
 
  • #6
just kidding you are right. i didnt read the first part that the charges are "on the y axis"
 
  • #7
ok, i don't know how to start. my initial thought is that E on the x-axis is zero. the three charges pull in the y direction. i can't see anything that would pull/push in the x-direction. is this right?
 
  • #8
kirby2 said:
ok, i don't know how to start. my initial thought is that E on the x-axis is zero. the three charges pull in the y direction. i can't see anything that would pull/push in the x-direction. is this right?
At any location on the x-axis, let's say at x = a, the +2q charge is closer to the point x = a, than the two -q charges are. This means that at that location, the field due to the two negative charges is less than the field due tho the positive charges. Also, the electric field due to each of the two negative is not entirely in the x-direction. These two facts taken together tell us that the E field from the negative charges does not entirely cancel the E field from the positive charge.
 

What is Coulomb's Law?

Coulomb's Law is a fundamental law of electrostatics that describes the relationship between the electric force, the distance between two charged particles, and the magnitude of their charges.

What is the electric field?

The electric field is a vector field that describes the force exerted on a charged particle by other charged particles in its vicinity. It is defined as the force per unit charge at a given point in space.

How is the electric field related to Coulomb's Law?

Coulomb's Law can be used to calculate the magnitude and direction of the electric field at a given point in space, given the positions and charges of the particles in the system.

What is the charge on the y-axis?

The charge on the y-axis refers to the electric charge of a particle located on the y-axis in a two-dimensional coordinate system. This charge can be positive, negative, or zero.

How does the distance between two charged particles affect the electric field?

The electric field strength is inversely proportional to the square of the distance between two charged particles. This means that as the distance between the particles increases, the electric field strength decreases.

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