Advertisements
Advertisements
प्रश्न
What is an electric motor?
उत्तर
Electric motor : An electric motor is a device which converts the electrical energy into the mechanical energy.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
State two differences between an electromagnet and a permanent magnet.
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
Answer the following in short.
Name a few common appliances that use electromagnets.
Why is soft iron generally used as the core of the electromagnet?
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.
(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines.
(ii) Name the law which helped you to find the direction of the magnetic field lines.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
