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Two very thin metallic wires placed alon...

Two very thin metallic wires placed along X- and Y-axes carry equal currents as shown in Fig. AB and CD are lines at `45^@` with the axes. The magnetic field will be zero on the line

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The correct Answer is:
A
All points on `AB` are equidistant from the two wires. So, magnetic fields are equal and opposite. Thus, they cancel out.
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