Question

For uniform electric field, field lines are _______

Answer 1

A field line is a locus formed by a vector field and a starting position inside it. We have electric field lines for the electric fields. Electric charges, as we saw in Electrostatics, produce an electric field in the area around them. It functions as a type of "map," indicating the direction and strength of the electric field at various points in space. Michael Faraday created the notion of electric field lines, which allowed him to perceive the electric field more simply using intuition rather than quantitative analysis.

Complete answer:
A uniform electric field is one in which the intensity of the field is constant at all locations. The field strength does not fluctuate in a homogeneous electric field, and the field lines tend to be parallel and equidistant. They're all evenly spaced.
A potential difference between two charged or conducting plates held at a specific distance from each other is generally used to produce uniform fields. The plates are separated by an insulating medium or dielectric medium that is completely homogenous (pure). At the centre of the plates, the electric field will be uniform. It may, however, fluctuate or be non-uniform towards the plates' ends.
The strength of the field, on the other hand, is mostly determined by the applied potential difference between the plates and the actual distance between them. A strong electric field will arise from a greater potential difference or voltage. In terms of the distance factor, as the distance between the plates increases, the field weakens.
Hence Parallel and evenly spaced field lines depict a uniform electric field.
Electric field lines never form closed curves because they always start with a positive charge and conclude with a negative charge. They do not begin or end in mid-air. The number of electric field lines leaving or entering a positive or negative charge is proportional to its magnitude.
Lines in the electric field never cross. The field lines in a homogeneous electric field are straight, parallel, and evenly spaced. Because the electric field lines can never start and terminate on the same charge, they can never form complete loops. These field lines are always descending from greater to lower potential. Electric field lines do not exist if the electric field in a specific region of space is zero.

Note:
An electric field, also known as an electrostatic field, is the area around an electric charge where stress or electric force acts. The electric field is represented by the letter E. The electric field is measured in newtons per coulomb, which is equal to volts per metre in SI units. The electric field is represented by imaginary lines of force. The line of force for a positive charge moves away from the charge, whereas the line of force for a negative charge moves towards the charge.