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Exam
Olympiad workbook
Subject
NSEP
Chapter
Magnetic Effects of Current

Olympiad workbook · NSEP · Magnetic Effects of Current

Two long parallel wires carry currents of equal magnitude (I) but...

Two long parallel wires carry currents of equal magnitude (I) but in opposite directions. These wires are suspended from fixed rod PQ by four chords of equal length LL as shown. The mass per unit length of each wire is λ\lambda, the value of angle θ\theta substended by two chords OA and OB , assuming it to be small, is Two long parallel wires carry currents of equal magnitude (I) but in opposite directions. These wires are suspended

Options

  1. Aθ=Iμ04πλgL\theta=I \sqrt{\frac{\mu_0}{4 \pi} \frac{\lambda}{g L}}
  2. Bθ=Iμ0π1λgL\theta=I \sqrt{\frac{\mu_0}{\pi} \frac{1}{\lambda g L}}
  3. Cθ=Iμ04πgλL\theta=I \sqrt{\frac{\mu_0}{4 \pi} \frac{g}{\lambda L}}
  4. Dθ=\theta=\mathrm{I}μ0πλ g L\sqrt{\frac{\mu_0}{\pi} \frac{\lambda \mathrm{~g}}{\mathrm{~L}}}

Correct answer

B. θ=Iμ0π1λgL\theta=I \sqrt{\frac{\mu_0}{\pi} \frac{1}{\lambda g L}}

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