Class 7 Exam > Class 7 Questions > What is an electromagnet?a)A magnet made of w...
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What is an electromagnet?
- a)A magnet made of wood
- b)A magnet that works only in water
- c)A magnet created by electric current
- d)A permanent magnet that never loses its magnetism
Correct answer is option 'C'. Can you explain this answer?
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What is an electromagnet?a)A magnet made of woodb)A magnet that works ...
What is an Electromagnet?
An electromagnet is a type of magnet that is created by the flow of electric current. Unlike permanent magnets, which maintain a constant magnetic field, electromagnets can be turned on and off and their strength can be adjusted.
How Electromagnets Work
- Electric Current: When electric current flows through a wire, it generates a magnetic field around the wire.
- Coiling the Wire: If the wire is coiled into a loop or several loops (known as a solenoid), the magnetic field becomes stronger.
- Iron Core: Placing an iron core inside the coil further enhances the magnetic field, creating a powerful electromagnet.
Applications of Electromagnets
- Electric Motors: Used to convert electrical energy into mechanical energy.
- Magnetic Lifting: Employed in cranes to lift heavy metal objects in junkyards and construction sites.
- Magnetic Locks: Found in security systems to secure doors and safes.
Advantages of Electromagnets
- Control: They can be turned on and off, allowing for flexible use in various applications.
- Adjustable Strength: The strength of the magnet can be varied by changing the electric current.
In summary, an electromagnet (option 'C') is a magnet created by electric current, making it distinct from other types of magnets.
An electromagnet is a type of magnet that is created by the flow of electric current. Unlike permanent magnets, which maintain a constant magnetic field, electromagnets can be turned on and off and their strength can be adjusted.
How Electromagnets Work
- Electric Current: When electric current flows through a wire, it generates a magnetic field around the wire.
- Coiling the Wire: If the wire is coiled into a loop or several loops (known as a solenoid), the magnetic field becomes stronger.
- Iron Core: Placing an iron core inside the coil further enhances the magnetic field, creating a powerful electromagnet.
Applications of Electromagnets
- Electric Motors: Used to convert electrical energy into mechanical energy.
- Magnetic Lifting: Employed in cranes to lift heavy metal objects in junkyards and construction sites.
- Magnetic Locks: Found in security systems to secure doors and safes.
Advantages of Electromagnets
- Control: They can be turned on and off, allowing for flexible use in various applications.
- Adjustable Strength: The strength of the magnet can be varied by changing the electric current.
In summary, an electromagnet (option 'C') is a magnet created by electric current, making it distinct from other types of magnets.
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Community Answer
What is an electromagnet?a)A magnet made of woodb)A magnet that works ...
An electromagnet is formed when electric current flows through a wire coil, generating a magnetic field. Unlike a permanent magnet, it can be turned on or off by controlling the current.
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What is an electromagnet?a)A magnet made of woodb)A magnet that works only in waterc)A magnet created by electric currentd)A permanent magnet that never loses its magnetismCorrect answer is option 'C'. Can you explain this answer?
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