Electromagnets are made of soft iron because soft iron has low retentivity and low coercive force or low coercivity Soft iron is a soft magnetic material.
NEET UG 2010 — Physics Electromagnetism
Electromagnets are made of soft iron because soft iron has
Held on 30 Apr 2010 · Verified 9 Jul 2026.
low retentivity and high coercive force
high retentivity and high coercive force
low retentivity and low coercive force
high retentivity and low coercive force
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Two point charges +2μC and -2μC are placed 10 cm apart. The electric field at the midpoint is:
A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates is increasing at a constant rate with time. The magnetic field arising due to displacement current is :
Two identical charged conducting spheres $A$ and $B$ have their centres separated by a certain distance. Charge on each sphere is q and the force of repulsion between them is $F$. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres $A$ and $B$ (Radii of $A$ and $B$ are negligible compared to the distance of separation so that for calculating force between them they can be considered as point charges) is best given as :
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The current passing through the battery in the given circuit, is : 
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