GATE EE 2017 Set 1 — Question 4
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Electromagnetic Fields → Magnetostatics → Flux Density & Field Intensity
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Question
A solid iron cylinder is placed in a region containing a uniform magnetic field such that the cylinder axis is parallel to the magnetic field direction. The magnetic field lines inside the cylinder will
Correct answer
(A) bend closer to the cylinder axis
Solution
Iron is a ferromagnetic material with high relative permeability (). Magnetic field lines tend to follow the path of least magnetic reluctance, which corresponds to the path with the highest permeability. Consequently, the magnetic field lines will concentrate within the iron cylinder, bending closer to its axis to pass through the material.
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