How will you make an iron bar electromagnet ? Draw a diagram showing the polarities of an electromagnet
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firstly take a solenoid and pass current through it. then place a soft iron core into the solenoid for some time,after that you will observe that the iron core has got magnetic but this is a temporary magnet and can lose magnetism when:
a)heated
b)hammered
c)fell from a height
In this the polarity will be as same as a bar magnet.
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