CBSE Class 12 Physics 2023 Delhi Set 3 Paper

Question : 1 of 14

Marks: +1, -0

SECTION - A

Two horizontal thin long parallel wires, separated by a distance

r

carry current

I

each in the opposite directions. The net magnetic field at a point midway between them, will be

Solution: 👈: Video Solution

Magnetic field due to both the wires is

\frac{\mu_0 I}{4 \pi \left(\frac{r}{2}\right)} = \frac{\mu_0 I}{2 \pi r}

So, total field is

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

The direction will be vertically downward.

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