Magnetism and Electromagnetism
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

6338 N/Wb
633.8 N/Wb
63.38 N/Wb
63380 N/Wb

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Magnetism and Electromagnetism
The magnetic reluctance of a material

Increases with increasing cross-sec-tional area of material
Does not vary with increasing cross-sectional area of material
Decreases with increasing cross sectional area of material
Any of the listed here

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