@article{lima_2026,  title={A rigorous derivation of the electric field on the surface of a conducting sphere},  volume={48},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2025-0490},  DOI={10.1590/1806-9126-RBEF-2025-0490},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Lima, F.M.S.},  year={2026},  pages={e20250490} }