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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
Two very thin metallic wires placed along $X$ and $Y$-axis carry equal currents as shown here. $AB$ and $CD$ are lines at $45^\circ $ with the axes with origin of axes at $O$. The magnetic field will be zero on the line
  • ✓
    $AB$
  • B
    $CD$
  • C
    Segment $OB$ only of line $AB$
  • D
    Segment $OC$ only of line $CD$
✓

Answer

Correct option: A.
$AB$
a
(a) Every point on line $AB$ will be equidistant from $X $ and $Y$-axis. So magnetic field at every point on line $AB$ due to wire $1$ along $X$-axis is equal in magnitude but opposite in direction to the magnetic field due to wire along $Y$-axis. Hence ${B_{net}}$ on $AB = 0$

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