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The electric field from multiple point charges can be obtained by taking the vector sum of the electric fields of the individual charges. After calculating the individual point charge fields, their components must be found and added to form the components of the resultant field.

## How do you find the total electric field?

Here are some facts about the electric field from point charges: the magnitude of the electric field (E) produced by a point charge with a charge of magnitude Q, at a point a distance r away from the point charge, is given by the equation **E = kQ/r ^{2}**, where k is a constant with a value of 8.99 x 10

^{9}N m

^{2}/C

^{2}.

## How do you calculate the electric potential between two charges?

The equation for the electric potential due to a point charge is **V=kQr V = kQ r** , where k is a constant equal to 9.0×10^{9} N⋅m^{2}/C^{2}.

## What is the electric potential between two positive charges?

If you bring two positive charges or two negative charges closer, you have to do positive work on the system, which raises their potential energy. Since potential energy is proportional to **1/r**, the potential energy goes up when r goes down between two positive or two negative charges.

## What is a test charge in the electric field?

The charge that **is used to measure the electric field strength** is referred to as a test charge since it is used to test the field strength. The test charge has a quantity of charge denoted by the symbol q. … Since electric field is defined as a force per charge, its units would be force units divided by charge units.

## Can electric field be negative?

**Electric field is not negative**. It is a vector and thus has negative and positive directions. An electron being negatively charged experiences a force against the direction of the field. For a positive charge, the force is along the field.