Class 7 Exam > Class 7 Videos > Science Class 7 > What are Electromagnets?
What are Electromagnets? Video Lecture | Science Class 7
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FAQs on What are Electromagnets? Video Lecture - Science Class 7
| 1. What are electromagnets? |  |
Ans. Electromagnets are temporary magnets that are created by passing an electric current through a coil of wire. They are made up of a coil of wire wound around an iron core. When an electric current flows through the wire, it creates a magnetic field around the coil, turning it into a magnet.
| 2. How do electromagnets work? | |
Ans. Electromagnets work by using the principle of electromagnetism. When an electric current passes through a wire, it creates a magnetic field around the wire. By wrapping the wire into a coil and placing an iron core inside the coil, the magnetic field is concentrated and strengthened, resulting in a stronger magnet.
| 3. What are some uses of electromagnets? | |
Ans. Electromagnets have a wide range of applications. Some common uses of electromagnets include in electric bells, doorbells, electric motors, generators, MRI machines, speakers, and magnetic cranes. They are also used in various industrial processes, such as metal sorting and lifting heavy loads.
| 4. How can an electromagnet be made stronger? | |
Ans. There are a few ways to make an electromagnet stronger. One way is by increasing the number of turns on the coil. More turns of wire mean more magnetic field lines, resulting in a stronger electromagnet. Another way is by increasing the current flowing through the wire. The more current, the stronger the magnetic field. Lastly, using a stronger iron core can also enhance the strength of an electromagnet.
| 5. Can you control the strength of an electromagnet? | |
Ans. Yes, the strength of an electromagnet can be controlled by adjusting the current flowing through the wire. Increasing the current will make the electromagnet stronger, while decreasing the current will weaken it. This feature allows for the flexibility of using electromagnets in various applications, where the strength of the magnet needs to be adjusted according to the requirements.
Text Transcript from Video
what what oh you want to know why this
battery and cell wire is in the magnetic
kit did you know that electricity can
also create magnetism you don't believe
me okay take that wire and roll it over
a nail now tie both ends of this wire to
both sides of the battery cell take a
few paper pins near this nail see paper
pins are being attracted to the nail
this is called an electromagnet this
magnetic effect comes due to electricity
so when you run an electric current into
a wire it creates a magnetic field
making the wire and electromagnet the
difference between an electromagnet and
a regular magnet is that you can
increase or decrease the power of the
magnet by controlling the supply of
electric current if you increase the
amount of current it becomes more
powerful similarly if you decrease the
power it becomes less powerful so you
can control the power of magnetism and
an electromagnet electromagnets are used
in many appliances like the refrigerator
fans doorbells etcetera and they help
make our life easier okay now by what
battery and cell wire is in the magnetic
kit did you know that electricity can
also create magnetism you don't believe
me okay take that wire and roll it over
a nail now tie both ends of this wire to
both sides of the battery cell take a
few paper pins near this nail see paper
pins are being attracted to the nail
this is called an electromagnet this
magnetic effect comes due to electricity
so when you run an electric current into
a wire it creates a magnetic field
making the wire and electromagnet the
difference between an electromagnet and
a regular magnet is that you can
increase or decrease the power of the
magnet by controlling the supply of
electric current if you increase the
amount of current it becomes more
powerful similarly if you decrease the
power it becomes less powerful so you
can control the power of magnetism and
an electromagnet electromagnets are used
in many appliances like the refrigerator
fans doorbells etcetera and they help
make our life easier okay now by what
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Nov 15, 2024 Last updated |
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