B=<span><span>μ</span></span>*<span><span>μ</span></span>0*N*I/L
<span><span>μ0=4п*10^-7Гн/м</span></span>
<span><span>N=500</span></span>
<span><span>I=0,5A</span></span>
<span><span><span><span>μ</span></span>=5000</span></span>
<span><span>L=0,05m</span></span>
<span><span>B=5000*4*3,14*10^-7*500*0,5/0,05=31,4Тл</span></span>