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प्रश्न
Which magnet will you use?
Iron is to be separated from trash.
उत्तर
Electromagnet can be used to separate iron from trash.
संबंधित प्रश्न
State two ways of magnetising an iron piece?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
A straight wire is held vertical and current is passed in it in the upward direction. A compass needle is kept near the wire in north of it. How is the needle deflected? What is the change in the deflection of the needle if the current in wire is reversed?
State the purpose of the iron core.
Why is soft iron generally used as the core of the electromagnet?
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 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.
Write the answer in your word.
How is an electromagnet made?
