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Question

A source of a magnetic field is
  1. An isolated magnetic pole
  2. A static electric charge
  3. A magnet or a current wire
  4. None of the above

A
An isolated magnetic pole
B
A magnet or a current wire
C
A static electric charge
D
None of the above
Solution
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A magnet produces a magnetic field around it naturally.
However when current is passed through a wire also, it produces magnetic field around it. Thus a moving charge produces magnetic field around it.

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