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STD 12 - 4. Moving charges and magnetism — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 4. Moving charges and magnetism4 Marks
MCQ
A square loop, carrying a steady current $I,$ is placed in a horizontal plane near a long straight conductor carrying a steady current $I_1$ at a distance $d$ from the conductor as shown in figure. The loop will experience
  • ✓
    a net attractive force towards the conductor
  • B
    a net repulsive force away from the conductor
  • C
    a  net torque acting upward perpendicular to the horizontal plane
  • D
    a net torque acting downward normal to the horizontal plane
✓

Answer

Correct option: A.
a net attractive force towards the conductor
a
$F_{2}=-F_{4}$

$F_{1}=\frac{\mu_{0} I_{1} \Pi}{2 \pi d l}$

$F_{2}=\frac{\mu_{0} I_{1} I}{2 \pi(d+l)}$

$F_{1}>F_{3}$

$F_{n e t}=F_{1}-F_{3}$

So, wire attract loop.

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