TEACHGYAN.COM · CLASS 10 SCIENCE
Chapter 12: Magnetic Effects of Electric Current
Learning outcomes: Build a clear understanding of the chapter, apply key principles to real situations and prepare for competency-based questions.
Read the concepts, make a one-page summary, practise diagrams or calculations, and then attempt the questions at the end without looking at the notes.
1. Magnetic field and field lines
A magnetic field is the region where magnetic force can be experienced. Outside a bar magnet, field lines emerge from north and enter south; inside they continue from south to north, forming closed curves. Closer lines represent a stronger field. Field lines never intersect because the field has only one direction at a point.
2. Field around a current-carrying wire
A straight wire carrying current produces concentric circular magnetic field lines. Right-hand thumb rule: point the right thumb in the direction of current; curled fingers show the field direction. Reversing current reverses the field. The field becomes stronger when current increases and weaker farther from the wire.
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