a long straight wire carries a current of 35A at what distance from the wire will the magnetic field become?
a long straight wire carries a current of 35A at what distance from the wire will the magnetic field become comparable to the earth’s field of 5×10^-5 T?
The magnetic field at a perpendicular distance r from an infinitely long current carrying wire is
B(r) = ki/(2.pi.r)
where k = 4.pi x 10^-7 T.m.A^-1
r = ki/(2 x pi x B) = 4pi x 10^-7 x 35/(2pi x 5 x 10^-5) = 0.14 m
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