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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
The diagram shows a coil wound around a U-shaped soft iron bar AB.
- What is the polarity induced at the ends A and B when the switch is pressed?
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- What will be the polarities at A and B if the direction of current is reversed in the circuit?
principle of 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.
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 a soft iron core is inserted inside solenoid?
What is a permanent magnet? Give one use of it.
What energy conversion takes place during the working of a d c motor?
State the energy change that takes’place in a D. C. motor.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
