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प्रश्न
State the purpose of the iron core.
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उत्तर
The purpose of the iron core is to intensify the strength of the magnetic field inside the solenoid and thereby increase the strength of the electromagnet.
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
State two differences between an electromagnet and a permanent magnet.
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State the energy change that takes’place in a D. C. motor.
State the principle of a D. C. motor.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
