Hot Threads. Featured Threads. Log in Register. Search titles only. Search Advanced search…. Log in. Contact us. Close Menu. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Calculating electric potential. Thread starter hotcommodity Start date Jan 22, The Attempt at a Solution My main problem is whether or not to take the sign of each charge into account when I'm summing the voltage. I've read that the idea of superposition applies, but the voltage is a scalar, and needs to be handled differently.

A push in the right direction would be much appreciated. Calculate the electric potential due to each charge taking into account its sign. This seems strange to me. You're correct in being suspicious of that hotcommodity Remember one way to think of electric field is force per unit charge So if you put a unit charge there and there's a force like you saidthere's clearly electric potential there.

So how do I add the voltages? I assume that charge plays role in determining whether there's positive or negative voltage at any one point, but I'm not sure how to apply that concept. Additionally I'm wondering if any angles need to be taken into account when adding the voltages. See where this is going? So given those values of r, I'd have an electric potential of 2q at P? Log in or register to reply now!

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Hot Threads Frame of reference question: Car traveling at the equator. Seeking a simple logical argument to an interesting statement spring-mass motion.

What is the tension in a charged ring? Depth to which the sphere is submerged. Hitting a rocket with a projectile.Three positive charges are located at the corners of an equilateral triangle as in Figure P Find an expression for the electric potential at the center of the triangle.

The triangle formed in this case is equilateral triangle and hence the distance between the center and the charge is equal for the three points. Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

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Electric potential at the vertex of a triangle. Thread starter math4everyone Start date Sep 9, Tags electric potential. Member advised to use the homework template for posts in the homework sections of PF.

Determine the potential at the vertex P. Homework Helper. Insights Author. Gold Member.

## Electric Potential of a triangle?

Look at the drawing. Then express y in terms of x it's a straight line and integrate. Of course, first you need to find the potential of a line of charge of length y at perpendicular distance x from one of its ends. TSny Homework Helper. Strip geometry. You probably could see the area of your element as dydx and integrate your potential function over the entire surface one tip: try using polar coordinates.

Log in or register to reply now! Hot Threads Frame of reference question: Car traveling at the equator. Seeking a simple logical argument to an interesting statement spring-mass motion. What is the tension in a charged ring? Depth to which the sphere is submerged. Hitting a rocket with a projectile.The electric potential voltage at any point in space produced by any number of point charges can be calculated from the point charge expression by simple addition since voltage is a scalar quantity.

The potential from a continuous charge distribution can be obtained by summing the contributions from each point in the source charge.

The calculation of potential is inherently simpler than the vector sum required to calculate the electric field. The electric field outside a spherically symmetric charge distribution is identical to that of a point charge as can be shown by Gauss' Law. So the potential outside a spherical charge distribution is identical to that of a point charge. The electric field from multiple point charges can be obtained by taking the vector sum of the electric fields of the individual charges.

Multiple Point Charges The electric potential voltage at any point in space produced by any number of point charges can be calculated from the point charge expression by simple addition since voltage is a scalar quantity.

Index Voltage concepts. Multiple Point Charges The electric field from multiple point charges can be obtained by taking the vector sum of the electric fields of the individual charges. Label diagram for calculation. Index Electric field concepts. After calculating the individual point charge fieldstheir components must be found and added to form the components of the resultant field.

The resultant electric field can then be put into polar form. Care must be taken to establish the correct quadrant for the angle because of ambiguities in the arctangent.So, in order to find the net electric field at point "P"we will have to analyze the electric field produced by each charge and how they interact cancel or add together.

We can draw a diagram of the situation, keeping in mind that positive charges create electric fields with vectors that point away from them. I will only draw in a couple of the vectors—those that are relevant to the problem—but as in the above picture, the field lines point out or in in every direction from the charge. Since we are given the radius 0.

You can see that the electric field vectors of the charges create a right triangle, and since we have both of the side lengths, we can use the Pythagorean theorem to calculate the hypotenuse, our missing radius.

## 7.4: Calculations of Electric Potential

This field vector occurs at an angle relative to "P"however, so we will have to use trigonometry to break it up into its parallel and perpendicular components—just like we do with forces. Before we calculate the components, we'll have to find the angle.

We can do this using the arctangent function, since we have both of the triangle's side lengths. Note that because all of these components occur above the positive x-axis and to the right of the origin, all of them have positive values.

This may not always be the case, so be sure to keep track of your signs. What is the net electric field? Aug 7, The radius is 0.

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See all questions in The Electric Field. Impact of this question views around the world. You can reuse this answer Creative Commons License.Point charges, such as electrons, are among the fundamental building blocks of matter. Furthermore, spherical charge distributions such as charge on a metal sphere create external electric fields exactly like a point charge. The electric potential due to a point charge is, thus, a case we need to consider. We can use calculus to find the work needed to move a test charge q from a large distance away to a distance of r from a point charge q.

To find the voltage due to a combination of point charges, you add the individual voltages as numbers. To find the total electric field, you must add the individual fields as vectors, taking magnitude and direction into account. What is the voltage 5. As we discussed in Electric Charges and Fieldscharge on a metal sphere spreads out uniformly and produces a field like that of a point charge located at its center.

The negative value for voltage means a positive charge would be attracted from a larger distance, since the potential is lower more negative than at larger distances. Conversely, a negative charge would be repelled, as expected. A demonstration Van de Graaff generator has a What excess charge resides on the sphere? Assume that each numerical value here is shown with three significant figures.

The potential on the surface is the same as that of a point charge at the center of the sphere, The radius of the sphere is This is a relatively small charge, but it produces a rather large voltage. We have another indication here that it is difficult to store isolated charges.

Recall that the electric field inside a conductor is zero. Hence, any path from a point on the surface to any point in the interior will have an integrand of zero when calculating the change in potential, and thus the potential in the interior of the sphere is identical to that on the surface.

The voltages in both of these examples could be measured with a meter that compares the measured potential with ground potential. Ground potential is often taken to be zero instead of taking the potential at infinity to be zero. It is the potential difference between two points that is of importance, and very often there is a tacit assumption that some reference point, such as Earth or a very distant point, is at zero potential.

Just as the electric field obeys a superposition principle, so does the electric potential. What is the net electric potential V at a space point P from these charges? Each of these charges is a source charge that produces its own electric potential at point Pindependent of whatever other changes may be doing.Consider three point charges at the vertices of an equilateral triangle.

Let the potential be zero at infinity. The value of the Coulomb constant is. So basically there is a picture of an equilateral triangle angle 60 and the three charges are 3.

What is the electrostatic potential at the point P at the center of the base of the equilateral triangle given in the diagram? I got this: Trending News. Hailey Bieber endorses Biden — while dad backs Trump.

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The value of the Coulomb constant is 8.

**Seven charged particles are fixed in place to form a square**

Find the total electrostatic energy of the system, again with the zero reference at infinity. Answer in units of J. My answer is not correct. I NEED help on this one. Update: i forgot. Answer Save. Pearlsawme Lv 7. Favorite Answer.

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