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प्रश्न
State the condition when an electric charge can give rise to a magnetic field.
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उत्तर
When an electric charge flows in a conductor, a magnetic field is produced around it.
संबंधित प्रश्न
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
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 ______.
State the two properties of the magnetic lines of force around a circular coil.
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State two advantages of an electromagnet over a bar magnet.
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State three factors which govern the speed of rotation of an electric motor.
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