Baluyot, L.M., Alcala, J.M. and Virtusio, N.S.D. 2003. Engineering students’ concepts and conceptual difficulties in electricity and magnetism. Proceedings of the Samahang Pisika ng Pilipinas, 21(1), SPP-2003-1F-02. URL: https://proceedings.spp-online.org/article/view/SPP-2003-1F-02.