When a positive charge moves in the direction of the electric field then the field does?

If the positive charge moves in the direction of the field, the field does positive work on the charge. If the negative charge moves opposite the direction of the field, the field does positive work on the charge. If the negative charge moves in the direction of the field, the field does negative work on the charge.

When a positive charge is released in an electric field it moves from a point of potential?

When the positive charge is at rest, it has maximum potential energy. But when it is released from rest in the uniform electric field, it starts moving and its potential energy gets converted into kinetic energy. Therefore, the potential energy of the charge does not remain constant or increase.

Is the work done in moving a unit of positive electric charge from one point to another?

The work W done in moving the positive charge through a distance d is W = F′d = −qEd. The electric potential is another useful field. Therefore, the work done in moving a unit charge from one point to another (e.g., within an electric circuit) is equal to the difference in potential energies at each point.

What is work done by electric field?

Electric field work is the work performed by an electric field on a charged particle in its vicinity. The work per unit of charge is defined by moving a negligible test charge between two points, and is expressed as the difference in electric potential at those points.

In which case does an electric field do positive work on a charged particle?

In the case where a negative change moves in a direction opposite to the electric field, q is negative and d is also negative. Therefore, W = (-q)E(-d) = qEd. The electric field does positive work in this case.

What is the work required to move a charge from infinity to?

Electric potential (V) at a point is defined as the work done (U) required to bring a charge (q) from infinity to that point divided by the charge: V = U/q. With this definition, V = 0 at infinity.

What is the work done in moving a charge on an equipotential surface?

zero
Work in moving a charge on a equipotential surface is zero.

Is electric field positive or 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.