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प्रश्न
Commercial electric motors do not use
पर्याय
an electromagnet to rotate the armature
effectively large number of turns of conducting wire in the current carrying coil
a permanent magnet to rotate the armature
a soft iron core on which the coil is wound
उत्तर
a permanent magnet to rotate the armature
Explanation -
An electric motor is a device that converts electric energy into mechanical energy.
An electric motor has an electromagnet instead of a permanent magnet (as a permanent magnet does not produce a strong magnetic field).
A large number of turns of the conducting wire in the current-carrying coil produce a stronger magnetic field.
It also has a soft iron core on which the coil is wound also known as an armature.
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संबंधित प्रश्न
write two uses of DC motor
Draw a labelled diagram of a D.C. motor showing its main parts.
What energy conversion does take place during the working of a d.c. motor?
State two ways by which the speed of rotation of an electric motor can be increased.
Name two appliances in which an electric motor is used.
In an electric motor the energy transformation is ______.
What is an electric motor?
Describe the working of an AC generator with the help of a labelled circuit diagram. What changes must be made in the arrangement to convert it to a DC generator?
State two factors affecting the coil's rotation speed in a D.C. motor.
State the principle of an electric motor.
