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L11 : Electromagnet - Electric Current & Circuits, Science, Class 7 Video Lecture

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FAQs on L11 : Electromagnet - Electric Current & Circuits, Science, Class 7 Video Lecture

1. What is an electromagnet and how does it work?
Ans. An electromagnet is a type of magnet that is created by passing an electric current through a coil of wire. It works based on the principle of electromagnetism, which states that a magnetic field is produced whenever an electric current flows through a conductor.
2. How is an electromagnet different from a permanent magnet?
Ans. An electromagnet can be turned on and off by controlling the electric current flowing through it, whereas a permanent magnet always has a magnetic field. Additionally, the strength of an electromagnet can be adjusted by changing the amount of current flowing through it, while the strength of a permanent magnet is fixed.
3. What are the applications of electromagnets?
Ans. Electromagnets have a wide range of applications in various fields. Some common uses include in electric motors, generators, loudspeakers, magnetic resonance imaging (MRI) machines, and magnetic separators in industries.
4. How can we increase the strength of an electromagnet?
Ans. The strength of an electromagnet can be increased by increasing the number of coils in the wire, increasing the current flowing through the wire, and using a ferromagnetic core material, such as iron, within the coil. These factors contribute to a stronger magnetic field being generated.
5. Can an electromagnet work without electricity?
Ans. No, an electromagnet requires electricity to generate a magnetic field. Without an electric current flowing through the coil, there will be no magnetic field produced. Once the electric current is turned off, the magnetic field also disappears.
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