[单选题]
A high power line carrying 1000 A generate** )anw/walq9kfdeyx f9vr +1s what magnetic fieldcz1/lsb , yjs v08fk0 whlt7(x at the ground, 10 m away?j0fb7l(scz1ys8t kw 0/xv,hl
A. $4.7 \times 10^{-6} \; T$
B. $6.4 \times 10^{-6} \; T$
C. $2.0 \times 10^{-5} \; T$
D. $5.6 \times 10^{-5} \; T$
