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NEET 2011
Exam
NEET
Year
2011
Subject
Physics
Chapter
Magnetic Effects of Current

NEET 2011 · Physics · Magnetic Effects of Current

A square loop, carrying a steady current I , is placed in a...

A square loop, carrying a steady current II, is placed in a horizontal plane near a long straight conductor carrying a steady current I1I_1 at a distance dd from the conductor as shown in figure. The loop will experience A square loop, carrying a steady current I , is placed in a horizontal plane near a long straight conductor carrying a

Options

  1. Aa net repulsive force away from the conductor
  2. Ba net torque acting upward perpendicular to the horizontal plane
  3. Ca net torque acting downward normal to the horizontal plane
  4. Da net attractive force towards the conductor

Correct answer

D. a net attractive force towards the conductor

Step-by-step solution

A square loop, carrying a steady current I , is placed in a horizontal plane near a long straight conductor carrying a
F2=−F4F1=μ0I1Il2πdF2=μ0I1Il2π(d+l)F1>F3Fnet =F1−F3\begin{aligned}& \mathbf{F}_2=-\mathbf{F}_4 \\ & \mathbf{F}_1=\frac{\mu_0 I_1 I l}{2 \pi d}\\ & \mathbf{F}_2=\frac{\mu_0 I_1 I l}{2 \pi(d+l)}\\ & \mathbf{F}_1>\mathbf{F}_3 \\ & F_{\text{net }}=F_1-F_3 \end{aligned} So, wire atrract loop.
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