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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
State two differences between an electromagnet and a permanent 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.
Electric bell ______.
Answer the following in short.
Name a few common appliances that use electromagnets.
State the two properties of the magnetic lines of force around a circular coil.
Why is soft iron generally used as the core of the electromagnet?
What is a permanent magnet? Give one use of it.
What energy conversion takes place during the working of a d c motor?
State the energy change that takes’place in a D. C. motor.
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
Which magnet will you use?
Iron is to be separated from trash.
