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:

Magnetic field due to both the wires is

\;{µ_0 I}/{4 π (\;{r}/{2}) }=\;{µ_0 I}/{2 π r}

So, total field is

2 × \;{µ_0}/{2 π} \;{I}/{r}=\;{µ_0}/{π} \;{I}/{r}

The direction will be vertically downward.

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