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Two long straight parallel conductors $10 \mathrm{~cm}$ apart, carry equal currents of magnitude $3 \mathrm{~A}$ in the same direction. Then, the magnetic induction at a point midway between them is
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The correct answer is:
zero
At the mid point of two conductors, the magnetic induction. $B_1=B_2=B$ and $\vec{B}_1$ is anti $\|^{\mathrm{r}}$ to $\vec{B}_2$.
Therefore, the net magnetic induction due to two wire at the mid points is
$B_{\mathrm{N}}=B_1-B_2=0$
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