Every Magnetostatics question asked in GPSC DEE Electrical, GPSC AE Electrical — solve, check instantly, then read the formula and exam tip.
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A diamagnetic material has permeability slightly below that of free space, equivalently relative permeability μr slightly less than 1. It develops a weak magnetization opposite to the applied field.
View answer & solutionDiamagnetic substances have a small negative susceptibility, so μr = 1 + χm is slightly less than 1.
View answer & solutionAmpere's circuital law relates circulation of magnetic field to enclosed current for magnetostatic cases. Symmetric geometries such as an infinite straight conductor or long solenoid make the integral law especially useful. Key relation: ∮H·dl=I_enclosed (magnetostatic); ∮H·dl=I_c+d/dt∫D·dS (general form).
Exam focus: For time-varying fields, use the Ampere-Maxwell form. Common trap: Saying Ampere's law has no time-varying extension is incomplete.
View answer & solutionMagnetic flux density is solenoidal because ∇·B=0—there are no magnetic monopoles. A static magnetic field is not generally conservative in regions containing current, since Ampère’s law gives ∇×H=J. Therefore statement 1 is true and statement 2 is false, matching option A.
