Question

The most suitable material for making the core of an electromagnet is:

• A. brass
• B. soft iron
• C. aluminium
• D. steel

Hint:

For electromagnets: - Use materials with high magnetic permeability and low retentivity. - Soft iron is preferred because it can quickly gain and lose magnetism.

Answer 1

The Correct Option is B

Step 1: Understand the role of the core in an electromagnet. The core of an electromagnet should: - Enhance the magnetic field, - Magnetize and demagnetize quickly with the current.
Step 2: Compare materials. -
Soft iron has high magnetic permeability and low retentivity, making it ideal. -
Steel retains magnetism and is not easily demagnetized. -
Brass and
aluminium are non-magnetic materials.
Step 3: Conclude. Thus,
soft iron is the most suitable material for the core of an electromagnet.