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प्रश्न
State the function of a split ring in D.C. motor.
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उत्तर
When the coil of a D. C motor turns through 180°, the split ring reverses the direction of the current in the coil from CBAD to DABC.
In this way, the coil continues to rotate continuously in the same direction and positive and negative polarities are maintained.
संबंधित प्रश्न
What is an electric motor?
Name the material of core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator and (e) a transformer.
What is an electromagnet?
State two factors on which the strength of induced e. m.f. depends.
State the purpose of the iron core.
State the energy change that takes’place in a D. C. motor.
What is dynomo (a.c. generator)? State the principle on which it works.
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.
State and explain Maxwell’s Cork Screw Rule.
