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Q

Two long parallel wires are at a distance $\dpi{100} 2d$ apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation of the magnetic field $\dpi{100} B$ along the line $\dpi{100} XX'$    is given by

• Option 1)

• Option 2)

• Option 3)

• Option 4)

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As we learnt in

Force between two parallel current carrying conductors -

$F=\frac{\mu }{4\pi } \frac{2I_{1 I_{2}}}{a} l$

$\frac{F}{l}=\frac{\mu o}{4\pi } \frac{2I_{1 I_{2}}}{a}$

- wherein

I1 and I2 current carrying two parallel wires

a-seperation between two wires

The magnetic field varies inversly with distance for a long conductor.

$B\alpha \frac{1}{d}$

Option 1)

Incorrect

Option 2)

Correct

Option 3)

Incorrect

Option 4)

Incorrect

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