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प्रश्न
principle of an electric motor ?
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उत्तर
Principle: An electric motor (dc motor) works 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 and mechanical energy is obtained.
संबंधित प्रश्न
State two differences between an electromagnet and a permanent magnet.
Name the type of transformer shown in fig . What changes will you observe regarding the brightness of the lamp, if
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electromagnet ______.
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
Answer the following in short.
Name a few common appliances that use electromagnets.
State the two properties of the magnetic lines of force around a circular coil.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
What energy conversion takes place during the working of a d c motor?
What are the factors that govern the magnitude of force acting on a current carrying conductor which is freely suspended in a magnetic field?
Point out three differences between an electromagnet and a bar (or permanent) magnet.
