Q. The magnetic field produced by a long straight wire depends on

एक लंबे सीधे तार द्वारा उत्पन्न चुंबकीय क्षेत्र निर्भर करता है

Distance from wire
तार से दूरी

Length of wire
तार की लंबाई

Charge on wire
तार पर चार्ज

Voltage across wire
तार पर वोल्टेज

Magnetic field $B$ around a long straight wire carrying current $I$ is given by:

B = \frac{\mu_0 I}{2 \pi r}

where $r$ is the distance from the wire. The field decreases with increasing distance.

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