Electrostatic, Electric Field,Electrostatic potential energy

In summary, the problem involves a right triangle with a proton at the center and two charges, Q1 and Q3, at the other two vertices. The magnitudes of the net electric field, electrostatic force, and electrostatic potential at point P are determined using the given values for charge q and distance R. The principle of superposition is used to show that the electric fields from Q1 and Q3 do not cancel out, and the individual contributions from all three charges must be considered when solving for the net values at point P.
  • #1
blee22
2
0

Homework Statement


In the figure below, a right triangle, determine the magnitudes of the
a. Net e-field at p (assume a proton is placed at p)
b. Net electrostatic force at P
c. Net electrostatic potential at P
let q = 1.70 x 10^-8, R = 78cm and P is halfway between Q1 and Q3
Red dot is P
upload_2016-3-7_11-9-18.png

A^2 + B^2 = C^2 C = Sqrt(78^2+78^2)= 78sqrt(2)

Homework Equations


F= (K|q1q2|)/R^2
E= (k|q|)/ R^2
PE = (kq1q2)/R

The Attempt at a Solution


I just had a question about this problem, Since a proton is at the center, would Q1 and Q3 just cancel out since there are repelling one another and are the same charge?

If that is true would i just solve everything for the two point charges, proton and Q2 since i know what R would be between the two?
 
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  • #2
When you're not sure if you can trust your intuition or the apparent symmetry, you can always fall back on the math for reassurance.

The principle of superposition tells us that when you have a system of charges, the electric field at a point is the vector sum of all of the individual fields produced by the charges at that point. So when you sum the individual electric field contributions at point P, do E1 and E3 actually sum to zero?
 

Related to Electrostatic, Electric Field,Electrostatic potential energy

1. What is electrostatics?

Electrostatics is the study of electric charges at rest. It involves the analysis of forces between charged particles, electric fields, and the potential energy associated with these interactions.

2. What is an electric field?

An electric field is a region in space where a charged particle experiences a force. It is created by a source charge and its strength is determined by the magnitude and direction of the charge.

3. How is electrostatic potential energy related to electric fields?

Electrostatic potential energy is the energy associated with the interaction between two charged particles in an electric field. The potential energy is directly proportional to the magnitude of the charges and the strength of the electric field.

4. Can electrostatic potential energy be measured?

Yes, electrostatic potential energy can be measured using a device called an electrostatic voltmeter. This instrument measures the work required to move a charge from one point to another in an electric field, which is directly related to the potential energy.

5. How is the concept of electric potential different from electric potential energy?

Electric potential refers to the amount of potential energy per unit charge at a certain point in an electric field. It is a scalar quantity, while electric potential energy is a measure of the total energy between two charged particles.

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