How do electric field lines indicate the strength of the field?

Question

by how long the lines are
by how close the lines are
by the direction the lines are pointing
by showing the charge that creates the lines

Answer 1

Electric field lines indicate the strength of the electric field primarily by how close the lines are to each other.

When electric field lines are closer together, it indicates a stronger electric field in that region, while lines that are further apart indicate a weaker electric field. The density of the field lines represents the strength of the field. Therefore, the correct answer is by how close the lines are.

The direction of the lines indicates the direction of the electric field, which points away from positive charges and toward negative charges.