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प्रश्न
State the principle of a D. C. motor.
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उत्तर
It is based on the principle that when an electric current is passed through a conductor placed normally in a magnetic field, a force acts on the conductor as a result of which the conductor begins to move. The direction of the force is obtained with the help of Fleming’s left hand rule.
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?
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
State three uses of an electromagnet?
Answer the following in short.
Name a few common appliances that use electromagnets.
How does a magnetic field set up by a solenoid change when a soft iron core is inserted inside solenoid?
What energy conversion takes place during the working of a d c motor?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
Which magnet will you use?
Iron is to be separated from trash.
