dB=μ0Idsinθ4πr2d B=\frac{\mu_{0} I d \sin \theta}{4 \pi r^{2}}dB=4πr2μ0Idsinθ
dB=μ0Idlsinθr2d B=\frac{\mu_{0} I d l \sin \theta}{r^{2}}dB=r2μ0Idlsinθ
dB=μ04πr2Idsinθd B=\frac{\mu_{0}}{4 \pi} \frac{r^{2}}{I d \sin \theta}dB=4πμ0Idsinθr2
dB=4πIdlsinθμ0r2d B=\frac{4 \pi I d l \sin \theta}{\mu_{0} r^{2}}dB=μ0r24πIdlsinθ
