Question:
Soft iron is used in making an electromagnet because
Soft iron is used in making an electromagnet because
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An electromagnet core must magnetise strongly and lose its magnetism when the current is switched off.
Updated On: Nov 12, 2026
- It has low permeability
- It has high coercivity
- It has high retentivity
- It has low retentivity
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
An electromagnet needs a core that is easily magnetised and easily demagnetised.
Step 2: Properties of soft iron
Soft iron has high permeability, low coercivity and low retentivity.
Step 3: Why low retentivity
Low retentivity means it keeps very little magnetism when the current is switched off, so the electromagnet can be turned off.
Step 4: Compare the options
The correct reason is low retentivity, option (D).
Final Answer:
Soft iron is used because it has low retentivity. \[ \boxed{\text{(D) }\text{It has low retentivity}} \]
An electromagnet needs a core that is easily magnetised and easily demagnetised.
Step 2: Properties of soft iron
Soft iron has high permeability, low coercivity and low retentivity.
Step 3: Why low retentivity
Low retentivity means it keeps very little magnetism when the current is switched off, so the electromagnet can be turned off.
Step 4: Compare the options
The correct reason is low retentivity, option (D).
Final Answer:
Soft iron is used because it has low retentivity. \[ \boxed{\text{(D) }\text{It has low retentivity}} \]
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