(a) How can a magnetic fkeld be produced without using a magnet?
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When current passes through a wire or a conductor then it creates an electromagnetic field which this helps in creating magnetic field.
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Every Electric Current creates magnetic field around it. These can be magnified by winding the wire as a coil you may use hundred or event thousand of turn and so create quite large magnetic field with with low current. this arrangement is then called as an Electromagnet..
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