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JEE Advanced 2006
Exam
JEE Advanced
Year
2006
Subject
Physics
Chapter
Magnetic Effects of Current

JEE Advanced 2006 · Physics · Magnetic Effects of Current

Which of the following statement is correct in Infinitely long wire...

 Which of the following statement is correct in Infinitely long wire kept perpendicular \text{ Which of the following statement is correct in Infinitely long wire kept perpendicular }to the paper carrying current inwards the given figure? Which of the following statement is correct in Infinitely long wire kept perpendicular to the paper carrying current

Options

  1. Anet force on the loop is zero
  2. Bnet torque on the loop is zero
  3. Cloop will rotate clockwise about axis OO′\mathrm{OO}^{\prime} when seen from OO
  4. Dloop will rotate anti-clockwise about OO′\mathrm{OO}^{\prime} when seen from OO

Correct answer

A. net force on the loop is zero

Step-by-step solution

FBA=0\mathbf{F}_{B A}=0, because magnetic lines are parallel to this wire. FCD=0\mathbf{F}_{C D}=0, because magnetic lines are antiparallel to this wire. FCB\mathbf{F}_{C B} is perpendicular to paper inwards and FAD\mathbf{F}_{A D} is perpendicular to paper outwards. These two forces (although calculated by integration) cancel each other but produce a torque which tend to rotate the loop in clockwise direction about an axis OO′O O^{\prime}.
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