Advertisements
Advertisements
Question
State the principle of a D. C. motor.
Solution
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.
APPEARS IN
RELATED QUESTIONS
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
What is an electromagnet?
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
What is an electromagnet?
A straight wire is held vertical and current is passed in it in the upward direction. A compass needle is kept near the wire in north of it. How is the needle deflected? What is the change in the deflection of the needle if the current in wire is reversed?
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 will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
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?
