magnetic field concept

We present a study about magnetic field concept ideas of students enrolled in Mexican high schools. We administered a pre-test and a post-test using the evaluation instrument CSM, which is part of the Conceptual Survey on Electricity and Magnetism (CSEM) to the students from a public high school and to the students from a private school. Students answered questions about the magnetic field concept in the pretest and then performed experiments through collaborative work at the laboratory. Finally, students took a post-test, results obtained from students answers analysis, are presented at the end of this paper