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Question

Soft iron is used for the construction of electromagnets because for iron
  1. the area of hysteresis loops is more.
  2. coersive force is high.
  3. retentivity is high.
  4. magnetic saturation limits is high and coercivity is low.

A
coersive force is high.
B
retentivity is high.
C
the area of hysteresis loops is more.
D
magnetic saturation limits is high and coercivity is low.
Solution
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Since for electro magnets we need materials which can be magnetised to very high magnetic fields as well as there magnetisation can be removed easily.
And in soft iron it has very high saturation limits as well as low coercivity means it requires very less field in opposite direction to demagnetise it.

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