Расчет: justx2 - 1

H =

I

/ ( 2* π

* r)

H =

I

/ ( 2* π

* r)

$$H$$ = $$\frac{I}{2\cdot \pi\cdot r}$$

H =

I

/ 2/ r/ π

$$H$$ = $$\frac{I}{2\cdot r\cdot \pi}$$

H =

0.5* I

/ r/ π

$$H$$ = $$\frac{0.5\cdot I}{r\cdot \pi}$$