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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.
Electric bell ______.
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उत्तर
Electric bell magnet - soft iron
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संबंधित प्रश्न
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.
What is an electric motor?
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
State the purpose of the iron core.
State the energy change that takes’place 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.
A current-carrying solenoid is suspended so as to freely rotate in a horizontal plane. State in what direction will it rest. Give a reason for your answer.
or
When a solenoid that is carrying current is freely suspended, it comes to rest in a particular direction. Why does this happen?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
State the function of a split ring in D.C. motor.
