Q20 of 238 Page 82

Describe how an electromagnet could be used to separate copper from iron in a scrap yard.

Electromagnetic cranes are used to separate copper from iron in a scrap yard. Switch in on the curen energises the electromagnet, thus producing magnetic field. This magnetic field attracts the iron pieces, thus separating them from the copper.


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19

Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors?

 20

Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

 21

How does an electromagnet differ from a permanent magnet?

 21

Name two devices in which electromagnets are used and two devices where permanent magnets are used.