Having trouble finding the potential between two positive point charges.

[nontradstuden]

Homework Statement

How to find the potential between two positive point charges?

I don't know where I'm going wrong.

==I am adding V_1 and V_2. converted mC to C, cm to m, correct value of k.

V1= kq1 / r1
v2= kq2/ r2.


==I am adding both of these, but I'm not getting the correct answer.

===Problem:

A point charge of q1 = 2.37 µC is 44 cm from a charge of q2 =26.4 µC. Where is the electric field zero? What is the value of the potential there?
----------

electric field is zero at 0.101m (correct answer).

I have r1= .101m and r2= .44m - .101= .34m.

I'm using the correct value of k.

== The answer is given as 2.34 * 10^6 V.


Can you help me find out where I'm doing wrong?

 

[haruspex]

We cannot tell where you are going wrong if you do not post all your working.

 

[nontradstuden]

We cannot tell where you are going wrong if you do not post all your working.

Edit: The potential at the point is equal to the sum of the two potentials of the two point charges.

V= kq_1 / r_1 + kq_2 /r_2

V= (9*10^9 Nm^2/C^2)* (2.37 * 10^-6 C)/ .101m + (9*10^9 Nm^2/C^2)*(26.4*10^-6 C) / .34m = 9.10*10^5 V.

The correct answer is 2.34 *10^6 V.

I don't know what I'm doing wrong.

 

[haruspex]

I agree with your answer (almost: 9.11e5).

 

[Nickie]

I understand your frustration in trying to find the potential between two positive point charges. It is important to double check your calculations and make sure you are using the correct units and values for the constants. In this case, the incorrect answer may be due to a small error in your calculations or a mistake in converting units. It may also be helpful to use a calculator or software to double check your results. Additionally, it is important to carefully read and understand the problem, as the given answer may be for a different part of the question. I suggest reviewing your steps and calculations and seeking assistance from a teacher or peer if needed. Keep in mind that mistakes are a natural part of the scientific process and it is important to learn from them. Keep trying and you will eventually find the correct answer.