[填空题]
A power line carries a ciidwy);g(lc6 urrent of 95 A along the tops of 8.5-m-high poles. Whqjq5p7 4 rdke)at is the magnitude o) jd4eqpr5k q7f the magnetic field produced by this wire at the ground? How does this compare with the Earth’s field of about $\frac{1}{2}G$? $ \times10^{-6 }\;T$ The field of the cable is about % that of the Earth.(retain two decimal places)
