A long wire carries a current of 5 mA. Find the line integral of B vector around the path (or radius 10 cm) enclosing the wire. (μ/4pi = 10^-7 S.I. units)
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Answer:
I=5A
x=0.2m
Magnetic field at a distance 0.2 m away from the wire.
B=
2πx
μ
0
I
=
2π×0.2
4π×10
−7
×5
=10×5×10
−7
=5×10
−6
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