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प्रश्न
Name a common device that uses electromagnets.
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उत्तर
Electromagnets are used in electric bell, door alarm, motor, dynamo etc.
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संबंधित प्रश्न
What do you understand by the term "electromagnetic induction"? Explain with the help of a diagram.
Name one device which works on the phenomenon of electromagnetic induction.
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
Electromagnetic induction means ______.
The diagram 10 shows two coils X and Y. The coil X is connected to a battery S and a key K. The coil Y is connected to a galvanometer G.
When the key K is closed. State the polarity
(i)At the end of the coil X,
(ii)At the end C of the coil Y,
(iii)At the end C of the coil Y if the coil Y is (a) Moved towards the coil X, (b) Moved away from the coil X.
List some of the practical applications of an electromagnet.
Why soft iron is preferred to be used as the core of the electromagnet of an electric bell?
Write Fleming’s right hand thumb rule with the help of diagram.
Establish the fact that the relative motion between the coil and the magnet induces an emf in the coil of a closed circuit.
Induced current flows through a coil ______.
