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The article discloses the importance of demonstration tasks in physics teaching in sec-ondary schools.  The place of the demonstration tasks and the possibilities of applying them during physics teaching are analyzed.  Four demonstration tasks of electrostatics phenomena in the secondary school are presented and analyzed. They are: Two types of electrical charge; Distribution of surface-charge density; Electric field of electrified sphere; Electric field of two electrically charged plates. Logical reasoning schemes to these physics demo tasks are developed. The proposed reasoning schemes designed to improve students' thinking, explaining the observed demonstrations of physical phenomena which help students to: un-derstand the essence of the demo task, determine cause - effect relationships and dependen-cies, compare the conditions and findings, summarize the results and do conclusions. Such using of demonstration tasks is useful to both of teacher and pupil: teacher manages the con-tent of teaching and a learning of pupils, pupils - are focused to self-activities, encouraged to think, analyze, summarize and do conclusions.  Key words: demonstration task, electrostatics phenomena, logical reasoning schemes, phys-ics teaching,

DEMONSTRATION TASKS AND THEIR LOGICAL REASONING SCHEMES IN THE SECONDARY SCHOOL ELECTROSTATICS COURSE