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प्रश्न
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electromagnet ______.
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उत्तर
Electromagnet core- soft iron
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संबंधित प्रश्न
State two ways of magnetising an iron piece?
Name the material used for making the armature of an electric bell. Give a reason for your answer.
State the condition when an electric charge can give rise to a magnetic field.
What is a permanent magnet? Give one use of it.
State three factors which govern the speed of rotation of an electric motor.
State the energy change that takes’place in a D. C. motor.
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting and the coil is minimum.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
Which magnet will you use?
Iron is to be separated from trash.
Write the answer in your words.
How is an electromagnet made?
