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प्रश्न
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
How can you increase the speed of rotation of coil in a DC motor?
State any two ways to increase the speed of rotation of the coil in a DC motor.
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उत्तर
The speed of rotation of the coil in a D.C. motor can be increased by:
- Increasing the strength of the current,
- Having more turns in the coil,
- Increasing the area of the coil,
- By increasing the strength of the magnetic field.
Notes
संबंधित प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
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?
State two factors on which the strength of induced e. m.f. depends.
State the purpose of the iron core.
What is dynomo (a.c. generator)? State the principle on which it works.
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.
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.
