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प्रश्न
State two advantages of an electromagnet over a permanent magnet.
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उत्तर
- An electromagnet can produce a strong magnetic field.
- The strength of the magnetic field of an electromagnet can easily be changed by changing the current in its solenoid.
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संबंधित प्रश्न
What are permanent magnets? Give one example ?
Write two characteristics of a material used for making permanent magnets ?
Why should the material used for making permanent magnets have high coercivity?
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