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Lines of magnetic flux which are parallel and in the same direction __________ each other.
Attract
Repel
Intersect
Cancel
Repel
Quick Trick: Remember the fundamental property of magnetic lines: like flexible elastic bands under tension, lines in the same direction push against each other sideways, causing mutual repulsion.
Remember the fundamental property of magnetic lines: like flexible elastic bands under tension, lines in the same direction push against each other sideways, causing mutual repulsion.
Analyze lateral elastic behavior of magnetic flux
Magnetic lines of force behave like stretched elastic cords. Along their length they tend to contract, but sideways (laterally) parallel lines traveling in the same direction push away from each other.
Apply lateral repulsion principle
Because adjacent parallel flux lines in the same direction exert lateral pressure on one another, they experience a force of repulsion that keeps them distinct and separated.
A: Attraction occurs between lines traveling in opposite directions, not the same direction. C: Magnetic field lines never intersect each other at any point. D: Flux lines reinforce each other rather than canceling out when in the same direction.
B is correct because parallel magnetic flux lines traveling in the same direction exert lateral pressure and repel each other.
Always remember two basic properties of flux lines: longitudinal contraction (attraction along length for opposite directions) and lateral repulsion (repulsion sideways for same direction). Also, flux lines NEVER cross each other.