Question

Is electric field always positive?

Answer 1

Explanation:

1. Every place in space where a charge exists in some form can be assumed to have an electric field associated with it. Electric force per unit charge is another name for the electric field.
2. The formula for the electric field is as follows: $E=\frac{F}{Q}$, Where $E$ is stand for electric field, $F$ for force, and $Q$ is the charge.
3. An electric field is defined as the force acting per unit of positive charge. (This means it is a vector like force is). The definition shows us that as positive charges repel, the field must be directed away from a positive charge and towards a negative charge If you move a positive charge in the direction of an electric field, work is done by the charge. If you move it the opposite way work has to be done on the charge.
4. To represent these two situations, it is not the field that is negative but the displacement vector. A movement in the direction of the field is a positive displacement whereas in the opposite direction to the field we say the displacement is negative.

Therefore,

1. Variable magnetic fields or electric charges are often the cause of electric fields. Volt per meter $\left(\raisebox{1ex}{$V$}\!\left/ \!\raisebox{-1ex}{$m$}\right.\right)$, a unit used in SI, is used to express electric field strength.
2. The force acting on the positive charge is assumed to be exerted in the direction of the field.
3. The electric field is directed radially towards the negative point charge and radially outwards from the positive charge.

A magnetic field of electricity is neutral. It is described as the force exerted by each positively charged particle. It is therefore a vector, just like force is. A positive charge can perform work if it is moved in the direction of an electric field.

Hence, an electric field cannot always be positive.