Class 10 Exam > Class 10 Questions > What should be the core of an electromagnet?a...
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What should be the core of an electromagnet?
- a)soft iron
- b)hard iron
- c)rusted iron
- d)none of above
Correct answer is option 'A'. Can you explain this answer?
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What should be the core of an electromagnet?a)soft ironb)hard ironc)ru...
The core of an electromagnet should be a) soft iron.
Explanation: Soft iron is used as the core of an electromagnet because of its high magnetic permeability, meaning it can easily magnetize and demagnetize in response to an external magnetic field. When an electric current is passed through a coil wrapped around the soft iron core, it becomes strongly magnetized and creates a strong magnetic field. When the current is removed, the magnetism of the soft iron core quickly disappears, allowing the electromagnet to be turned on and off easily. Hard iron, on the other hand, retains its magnetism longer and is not suitable for electromagnets that need to be switched on and off frequently. Rusted iron is not ideal because the rust would interfere with the magnetic properties and reduce the efficiency of the electromagnet.
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Explanation: Soft iron is used as the core of an electromagnet because of its high magnetic permeability, meaning it can easily magnetize and demagnetize in response to an external magnetic field. When an electric current is passed through a coil wrapped around the soft iron core, it becomes strongly magnetized and creates a strong magnetic field. When the current is removed, the magnetism of the soft iron core quickly disappears, allowing the electromagnet to be turned on and off easily. Hard iron, on the other hand, retains its magnetism longer and is not suitable for electromagnets that need to be switched on and off frequently. Rusted iron is not ideal because the rust would interfere with the magnetic properties and reduce the efficiency of the electromagnet.
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What should be the core of an electromagnet?a)soft ironb)hard ironc)ru...
A) Soft iron should be the core of an electromagnet.
Soft iron is a ferromagnetic material that can be easily magnetized and demagnetized. When a current flows through the wire coiled around the soft iron core, it creates a magnetic field. The soft iron core intensifies the magnetic field by concentrating the magnetic flux lines within it. This results in a stronger magnetic force than the wire alone could produce. Therefore, soft iron is the ideal core material for electromagnets.
Hard iron, on the other hand, is a type of ferromagnetic material that is difficult to magnetize and demagnetize. Rusted iron is not suitable for a core material as it is corroded and not a good conductor of electricity. Hence, the correct answer is (a) soft iron.
Soft iron is a ferromagnetic material that can be easily magnetized and demagnetized. When a current flows through the wire coiled around the soft iron core, it creates a magnetic field. The soft iron core intensifies the magnetic field by concentrating the magnetic flux lines within it. This results in a stronger magnetic force than the wire alone could produce. Therefore, soft iron is the ideal core material for electromagnets.
Hard iron, on the other hand, is a type of ferromagnetic material that is difficult to magnetize and demagnetize. Rusted iron is not suitable for a core material as it is corroded and not a good conductor of electricity. Hence, the correct answer is (a) soft iron.
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What should be the core of an electromagnet?a)soft ironb)hard ironc)ru...
The Core of an Electromagnet
The core of an electromagnet plays a crucial role in determining its performance and efficiency. It is responsible for amplifying the magnetic field generated by the flow of electric current through the coil. The most suitable material for the core of an electromagnet is soft iron. Let's explore why soft iron is the preferred choice for the core of an electromagnet.
1. Magnetic Properties:
Soft iron possesses excellent magnetic properties, making it an ideal choice for electromagnet cores. It has a high magnetic permeability, which means it can easily magnetize and demagnetize when subjected to an external magnetic field. Soft iron also has a low coercivity, which allows it to quickly align its magnetic domains with the external magnetic field, enhancing the magnet's overall strength.
2. High Saturation Point:
Soft iron has a high saturation point, which refers to the maximum magnetic field intensity that a material can withstand before it becomes saturated. Once a material reaches its saturation point, it can no longer increase its magnetization. Soft iron's high saturation point ensures that it can handle a large amount of magnetic flux, enhancing the overall magnetic field strength of the electromagnet.
3. Low Remanence:
Remanence refers to the residual magnetism retained by a material after the external magnetic field is removed. Soft iron has low remanence, which means it quickly loses its magnetism when the current through the coil is turned off. This property is vital for electromagnets as they need to be easily controllable and able to switch on and off as required.
4. Ductility and Malleability:
Soft iron is a ductile and malleable material, meaning it can be easily molded into various shapes and sizes. This characteristic allows manufacturers to design custom-shaped cores that optimize the magnetic field distribution and minimize energy losses.
5. Cost and Availability:
Soft iron is relatively inexpensive and readily available, making it a cost-effective choice for electromagnet cores. Its widespread availability ensures that manufacturers can easily source the material for large-scale production.
In summary, the core of an electromagnet should be made of soft iron due to its excellent magnetic properties, high saturation point, low remanence, ductility, malleability, cost-effectiveness, and availability. These characteristics make soft iron the ideal material for maximizing the strength and efficiency of electromagnets in various applications.
The core of an electromagnet plays a crucial role in determining its performance and efficiency. It is responsible for amplifying the magnetic field generated by the flow of electric current through the coil. The most suitable material for the core of an electromagnet is soft iron. Let's explore why soft iron is the preferred choice for the core of an electromagnet.
1. Magnetic Properties:
Soft iron possesses excellent magnetic properties, making it an ideal choice for electromagnet cores. It has a high magnetic permeability, which means it can easily magnetize and demagnetize when subjected to an external magnetic field. Soft iron also has a low coercivity, which allows it to quickly align its magnetic domains with the external magnetic field, enhancing the magnet's overall strength.
2. High Saturation Point:
Soft iron has a high saturation point, which refers to the maximum magnetic field intensity that a material can withstand before it becomes saturated. Once a material reaches its saturation point, it can no longer increase its magnetization. Soft iron's high saturation point ensures that it can handle a large amount of magnetic flux, enhancing the overall magnetic field strength of the electromagnet.
3. Low Remanence:
Remanence refers to the residual magnetism retained by a material after the external magnetic field is removed. Soft iron has low remanence, which means it quickly loses its magnetism when the current through the coil is turned off. This property is vital for electromagnets as they need to be easily controllable and able to switch on and off as required.
4. Ductility and Malleability:
Soft iron is a ductile and malleable material, meaning it can be easily molded into various shapes and sizes. This characteristic allows manufacturers to design custom-shaped cores that optimize the magnetic field distribution and minimize energy losses.
5. Cost and Availability:
Soft iron is relatively inexpensive and readily available, making it a cost-effective choice for electromagnet cores. Its widespread availability ensures that manufacturers can easily source the material for large-scale production.
In summary, the core of an electromagnet should be made of soft iron due to its excellent magnetic properties, high saturation point, low remanence, ductility, malleability, cost-effectiveness, and availability. These characteristics make soft iron the ideal material for maximizing the strength and efficiency of electromagnets in various applications.
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