[单选题]
A high power line carrying 1000 A ghwzy 3 rchrt uc;9:j4q 43w.vhenerates whbu, 0vuf ixvr7p 9fv2.at magnetic field at the ground, 10 m rv,bpi u v.vf u2x79f0away?
A. $4.7 \times 10^{-6} \; T$
B. $6.4 \times 10^{-6} \; T$
C. $2.0 \times 10^{-5} \; T$
D. $5.6 \times 10^{-5} \; T$
