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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
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.
Answer the following in short.
Name a few common appliances that use electromagnets.
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
State the principle of 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 an the coil is maximum.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
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.
