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A steady current I flows along an infinitely long straight wire with circular cross-section of radius R. What will be the magnetic field outside and inside the wire at a point r distance far from the axis of wire? |
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Answer» Solution :`B(2pir) = mu_(0)[ (1)/(piR^2) (pir^2)]` `B= ((mu_(0) I)/(2piR^2))R""(R GE r)` `oint OVERSET(to)(B).d overset(to)(I). = mu_(0) I` `therefore B = (mu_(0) I)/(2pir) ""(r ge R)` |
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