Question:
i have a doubt that B dl=ui which shows B =(ui)/dl that means B is inversely proportional to dl but B =(u i dl sin theta )/4pi shows B is directly proportional to dl .I am confused plsssss hlp me
Answer:
These two expressions are from two different laws.
∫B.dl= μo I
here, dl= line integral of the magnetic field.
This is from Amperes circuital law, which is for a closed circuit.
Whereas, dB= μo/4π.I dl sinΘ/r2
Is the expression from biot-savart law, here dl is current element.
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