# Electic field question - geometry

• flythisforme
In summary, the problem presented is finding the net electric field at point P due to 6 charges arranged in a pentagon. The distance from point P to point 1 of the pentagon is 4.99mm, and the length of each side of the pentagon is 4mm. The goal is to find the angle at point P in order to determine the x and y components of the line connecting point P to the side of the pentagon. Help is requested to determine if the line bisects the 54° angle at point 1, and the law of sines is suggested as a possible solution.
flythisforme
I have a problem where I need to find the net electric field on a point due to 6 charges. I attached the diagram. It is a pentagon of 5 charges with a 6th charge in the center. Each side of the pentagon is 4 mm, and there is a point P on the center of one side. I found that the line from point P to point 1 of the pentagon is 4.99mm, using the law of cosines. I need to figure out what the angle is at point P from the line to the side of the pentagon (the one I marked with a question mark), so I can find the x and y components of this line. I am not sure if the line bisects the 54° angle at point 1. Can someone help me with this?

Thanks a lot. I really appreciate it.

#### Attachments

• pentagon.JPG
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Are you trying to find the field at point P? All the x components cancel by symmetry..

Yeah, but I need the angle there to find the y component of it.

If line P to 1 is 5, then use the law of sines.

$$\frac{sin(a)}{A} = \frac{sin(b)}{B}$$

## 1. What is an electric field?

An electric field is a physical quantity that describes the strength and direction of the force experienced by a charged particle in the presence of an electric charge or distribution of charges.

## 2. How is the electric field calculated?

The electric field is calculated using the equation E = F/q, where E is the electric field, F is the force exerted on the charged particle, and q is the charge of the particle.

## 3. What is the relationship between electric field and distance?

The electric field is inversely proportional to the square of the distance from the source charge. This means that as distance increases, the electric field decreases.

## 4. How does the geometry of the charges affect the electric field?

The geometry of the charges can affect the electric field in several ways. For example, the shape and distribution of charges can determine the strength and direction of the electric field, as well as the potential energy of the system.

## 5. What are some real-world applications of electric fields?

Electric fields have many practical applications, including the operation of electronic devices, the production of electricity, and medical technologies such as MRI machines. They are also used in industries such as telecommunications, transportation, and energy production.

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