The best material for the core of the primary and secondary coils of an induction coil is
copper, because it has a good conductor of electricity
steel, because it becomes magnetic and retains its magnetism for a long time
rubber, because it is a good insulator and the user is prevented from shock
soft iron, because it becomes magnetic but easily loses its magnetism
glass, because it is transparent
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The best material for the core of the primary and secondary coils of an induction coil is D. soft iron, because it becomes magnetic but easily loses its magnetism.
Reason:
1. Soft iron has a high magnetic permeability, meaning it can easily become magnetized when in the presence of a magnetic field. This property is crucial for the functioning of an induction coil.
2. Soft iron can quickly and easily lose its magnetism once the magnetic field is removed. This property is important for the rapid cycling of magnetism required in induction coils.
3. Copper (option A) is a good conductor of electricity, but it is not an ideal material for the core of an induction coil as it does not easily magnetize or demagnetize.
4. Steel (option B) may retain its magnetism for a long time, but it is not as efficient as soft iron in quickly magnetizing and demagnetizing, which is essential for the proper operation of an induction coil.
5. Rubber (option C) is a good insulator but has no magnetic properties. The core of an induction coil needs to be magnetizable.
6. Glass (option E) is transparent and has no magnetic properties. It cannot be magnetized and is not suitable for the core of an induction coil.
The best material for the core of the primary and secondary coil of an induction coil is soft iron. Soft iron is preferred because it has high magnetic permeability and can quickly magnetize and demagnetize, which is crucial for the rapid, repeating magnetic field reversals needed in an induction coil.
Key Reasons for Soft Iron:
High Permeability: It concentrates magnetic flux efficiently.
Low Retentivity: It quickly loses magnetism, allowing for rapid cycling.
Eddy Current Reduction: The core is typically constructed from bundled, insulated soft-iron wires to minimize energy loss from eddy currents.
While the coils themselves are usually copper, the magnetic core must be soft iron to maximize efficiency.
