Final answer:
Electric field lines between a +20 μC and a -20 μC charge are drawn from positive to negative, while lines between two +20 μC charges repel and extend away from each other. A long distance from charge distributions, the field lines become parallel and uniformly spaced.
Step-by-step explanation:
When drawing the electric field lines between two charges, it is essential to consider the magnitude and direction of each charge. For two charges of +20 μC and -20 μC situated 5 cm apart, the field lines will begin on the positive charge and end on the negative charge, indicating the direction of the electric field from positive to negative.
The density of these lines will be proportional to the magnitude of the charges, which demonstrates the strength of the electric field at different points. In this case, the number of field lines leaving the positive charge should equal the number entering the negative charge, since they have the same magnitude but opposite signs.
In contrast, for two like charges, such as +20 μC and +20 μC, situated 5 cm apart, the electric field lines will repel each other. The field lines will emerge from both charges and will not connect, as they are indicating the repulsion between identical charges.
Finally, when considering the electric field a long distance from the charge distributions, the field lines will become parallel and uniformly spaced, showing that the electric field is uniform.