First slide

Magnetic field due to a straight current carrying wire

Question

Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is

Easy

A

$μ_{0} i / r$
B

$4 μ_{0} i / r$
C

Zero
D

$μ_{0} i / 4 r$

Solution

At P,
$\begin{array}{l} B_{net} = B_{1} - B_{2} \\ Since |B_{1}| = |B_{2}| \\ So, B_{net} = 0 \end{array}$

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