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प्रश्न
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
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उत्तर
The speed of rotation of the coil in a D.C. motor can be increased by:
(i) Increasing the strength of the current, (ii) Having more turns in the coil,
(iii) Increasing the area of the coil, (iv) By increasing the strength of the magnetic field.
संबंधित प्रश्न
You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
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On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
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How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State two advantages of an electromagnet over a bar magnet.
State the energy change that takes’place in a D. C. motor.
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State and explain Maxwell’s Cork Screw Rule.
