Point charges of equal magnitude are placed close together, as shown - Edexcel - A-Level Physics - Question 6 - 2023 - Paper 4

When considering two point charges of equal magnitude placed close together, we need to understand that the electric field lines produced by like charges will repel each other. Therefore, the correct diagram must show the electric field lines starting from each charge and moving outward, indicating that the field lines do not intersect or come together.

Among the provided diagrams A, B, C, and D, Diagram B accurately illustrates this concept by showing the electric field lines correctly emanating from both charges and repelling away from each other. In contrast, Diagrams A, C, and D either depict lines approaching the charges or incorrectly interacting with each other, which is not representative of the behavior of like charges.

Thus, the correct answer is B.