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How Does an Electromagnet Differ Forma Permanent Magnet? - Science

 How does an electromagnet differ forma permanent magnet?  

 

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Solution

     Electromagnet    Permanent magnet  
 1.  It is a temporary magnet.

1.

 

As the name suggests, it is a permanent magnet.
 2.  It can produce very strong magnetic force. 2. It produces a comparatively weak magnetic field.
 3.  Its polarity can be changed by changing the direction of current in the coil.  3. Its polarity is fixed and cannot be changed.
 4. Its strength can be changed by changing the number of turns or by changing the current. 4. Its strength  cannot be changed.  
  Is there an error in this question or solution?
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APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 2 Magnetic Effects of Electric Current
Q 21.1 | Page 82
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