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2022 11 16 20 16 34 27 782083
Corporate Law (BLAW 2001)
Savitribai Phule Pune University
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CHAPTER 14 (Cont'd) ELECTRIC CURRENT AND ITS EFFECTS
Magnetic effect of electric current
Q What do you mean by the magnetic effect of electric current? When an electric current passes through a wire, the current carrying wire behaves like a magnet. This is the magnetic effect of electric current.
Q What is an electromagnet? It is a temperory magnet made by using electric current. An electromagnet works on the magnetic effect of current. An electromagnet consists of a coil of insulated wire wound around a piece of iron which is magnetised only when an electric current passes through the coil.
Q. List the uses of electromagnet.
The electromagnets can be made very strong and can lift very heavy loads. They are used for lifting large masses of iron scrap,girders,plates etc. The electromagnets are also used to separate magnetic material from the junk. Doctors use tiny electromagnets to take out small pieces of magnetic material that have accidentally fallen in the eye. Many toys also have electromagnets inside them. Electromagnets are used in loudspeakers, electric bells,telegraphs etc.. Q. 4 a. Draw a labelled diagram to show how an electromagnet is made. 4. b. What is the purpose of the soft iron core used in making an electromagnet?
Answer: a.
An electric bell works on the principle of magnetic effect of electrIc current. ● An electric bell consists of a coil of wire wound on an iron piece. The coil acts as an electromagnet. ● An iron strip with a hammer at one end is kept close to the electromagnet. There is a contact screw near the iron strip the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet which pulls the iron strip. ● The hammer at the end of the strip strikes the gong of the bell to produce a sound. The pulling of the iron strip causes the break of the circuit. The current through the coil stops flowing. ● The coil is no longer an electromagnet and does not attract the iron strip and goes its original position and touches the contact screw again and completes the circuit. ● The electric current flows in the coil and the hammer strikes the gong again process is repeated in quick succession. The hammer strikes the gong every time the circuit is completed. This way an electric bell rings.
2022 11 16 20 16 34 27 782083
Course: Corporate Law (BLAW 2001)
University: Savitribai Phule Pune University
