Here are 10 one-word answer type questions from the topic Electromagnet with their answers and explanations:
Topic: Electromagnet
An electromagnet is a coil of insulated wire wrapped around a piece of soft iron. When electric current flows through the coil, the iron behaves like a magnet. Electromagnets are used in many devices like electric bells, cranes, and toys.
1. Question: What is a coil of wire wound around an iron piece called when current passes through it?
Answer: Electromagnet
Explanation: An electromagnet is formed when current passes through a coil of wire wound around a soft iron piece.
2. Question: Which material is commonly used as the core of an electromagnet?
Answer: Iron
Explanation: Soft iron is used as the core in electromagnets because it easily loses magnetism when current is stopped.
3. Question: What kind of effect of electric current is used in an electromagnet?
Answer: Magnetic
Explanation: Electromagnets work on the magnetic effect of electric current.
4. Question: What is produced around the coil when current flows through it?
Answer: Magnetic field
Explanation: A magnetic field is produced around the coil of wire when electric current passes through it.
5. Question: What happens to the electromagnet when the current is switched off?
Answer: Demagnetised
Explanation: The electromagnet loses its magnetic property when the current is switched off.
6. Question: In which electric device is an electromagnet used to produce sound?
Answer: Bell
Explanation: An electromagnet is used in an electric bell to attract an iron strip, which makes the bell ring.
7. Question: What type of wire is used to make the coil of an electromagnet?
Answer: Insulated
Explanation: An insulated wire is used to prevent short circuiting while making the coil.
8. Question: What can be separated from junk using an electromagnet?
Answer: Iron
Explanation: Electromagnets are used to separate magnetic materials like iron from junk.
9. Question: What is the shape of the magnetic field around a straight current-carrying conductor?
Answer: Circular
Explanation: The magnetic field around a straight current-carrying conductor is circular in shape.
10. Question: What is the energy source required to make an electromagnet work?
Answer: Battery
Explanation: A battery is used to supply electric current to the coil, making the iron piece an electromagnet.
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