Magnetic field at a distance 2 cm from a long straight wire is 8uT. what must be current through the wire .
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Magnetic field at a distance 2 cm from a long straight wire is 8uT. what must be current through the wire .
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Answer:
Correct option is B)
Given: Magnetic field= 12mT
Solution: The magnetic field due to the straight conductor carrying current is given by,
B=
2πr
μ
0
i
where, i is the current,
r is the distance from the axis and
μ
0
is the permeability constant.
i=
μ
0
2πrB
=
4π×10
−7
2π×2×10
−2
×12×10
−3