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ICSE Class 7 Physics Question 12 of 36

Electricity and Magnetism — Question 12

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Question 12

Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure.

Answer
  1. Take a soft iron bar PQ and wind a thin insulated copper wire around the bar.
  2. Connect a cell or a battery and a key K in series between the ends of a coil as shown in the below figure.
  3. When key is closed current passes through the winding of the coil and the bar becomes a magnet.
  4. But when key is opened the current stops flowing in the coil and bar gets demagnetized.
Draw a labelled diagram to make a soft iron bar as an electromagnet. Describe in steps the procedure. Electricity and Magnetism, Concise Physics Solutions ICSE Class 7.

So, soft iron bar behaves as an electromagnet when current passes through the coil.