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Describe two ways a magnetic field can be produced. How is each related to moving or...

Describe two ways a magnetic field can be produced.
How is each related to moving or circulating or “spinning” charge?
Science   Advanced-Physics   
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Answer #1

1. A moving charge in a straight line (current) produce the magnetic field in the form of circular rings around the wire. Example current in infinite long wire which produce magnetic field a distance d from the wire is ....

  

Where 3.14 is value of pi (π) .

2. Current flowing in a circular loop of radius R produce the magnetic field perpendicular to the plane of loop and along the axis of the loop .

Standard result magnetic field due to current flowing in circular loop ...

Where u0 is magnetic permeability = 4π*10^-7 H/m , I = current in the loop

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