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प्रश्न
What is an electromagnet?
उत्तर
An electromagnet — An electromagnet is a temporary magnet which behaves as a magnet when electric current is passed through the insulated copper wire and loses its magnetism when current is stopped. It has a soft iron piece called the core with an insulated copper wire wound on it.
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संबंधित प्रश्न
Write true or false for a given statement.
An electric bell uses an electromagnet.
Fill in the blank
The strength of the magnetic field of an electromagnet is increased by inserting a core of soft ______
Select the correct alternative
Electromagnets are made up of
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An electromagnet is used in
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The purpose of armature in an electric bell is
Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure ?
State two common uses of electromagnets ?
Draw a neat and labelled diagram of an electric bell and describe its working ?
The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer.
Describe the construction and working of an electric bell with the help of a diagram.
