The magnetic flux which does not follow the particularly intended path in a magnetic circuit is called-

Correct option is A

Leakage Flux
· In practical magnetic circuits, not all magnetic flux follows the intended path. Some of the flux "leaks" out of the core and passes through the surrounding air or other materials with lower permeability. This unwanted magnetic flux is known as leakage flux.
· Leakage flux does not contribute to the useful work in devices like transformers, inductors, or motors and is often considered a loss in the system.