Find the Electric field at point p

In summary, the problem is to calculate the net electric field at point P, using the equation E=(kq)/r^2 where k is Planck's constant and r is the distance or radius. However, the radius is not given in the problem statement.
  • #1
NotInMrPutmansClass
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Homework Statement
Calculate the net electric field at point P from the diagram below
Relevant Equations
E=(kq)/r^2

Where k is plank's constant 9×10^9
R= distance or radius
Since q3=q4 and they are opposite to each others they cancel out
But as soon as I try to find the electric field of one of the charges, I need the radius which is not given.

By isolating the electric field for radius

E=(kq)/r^2
I now have two unknowns
 

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  • #2
Can you post the full problem statement as it was given? (k is Coulomb's constant, not Planck's constant.)
 
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  • #3
NotInMrPutmansClass said:
Homework Statement:: Calculate the net electric field at point P from the diagram below
Relevant Equations:: E=(kq)/r^2

Where k is plank's constant 9×10^9
R= distance or radius

I need the radius which is not given.
What radius is this? You are given the positions of all charges relative to the point of interest P which is all you need to find the electric field at P. If you are not given a numerical value for distance ##d##, then leave it as ##d## in your answer.
 
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FAQ: Find the Electric field at point p

1. What is the electric field at point p?

The electric field at point p is a measure of the force per unit charge experienced by a test charge placed at that point. It is a vector quantity and is typically measured in units of Newtons per Coulomb (N/C).

2. How is the electric field at point p calculated?

The electric field at point p can be calculated using the formula E = kQ/r^2, where E is the electric field, k is the Coulomb's constant, Q is the source charge, and r is the distance between the source charge and point p.

3. What factors affect the electric field at point p?

The electric field at point p is affected by the magnitude and direction of the source charge, the distance between the source charge and point p, and any other nearby charges or conductors that may influence the field.

4. How does the electric field at point p relate to the potential at that point?

The electric field at point p is related to the potential at that point by the equation E = -∇V, where E is the electric field, V is the potential, and ∇ is the gradient operator. This means that the electric field points in the direction of decreasing potential.

5. Can the electric field at point p be negative?

Yes, the electric field at point p can be negative. This indicates that the direction of the field is opposite to the direction of the force experienced by a positive test charge placed at that point. Negative electric fields are commonly found in regions where there are more negative charges than positive charges, such as near an electron or in a negatively charged conductor.

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