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Three long parallel straight wires, X, Y and Z, are equally separated and placed in the same plane…

Physics20261 markMCQ
Three long parallel straight wires, X, Y and Z, are equally separated and placed in the same plane in a vacuum. They carry a current of $I$, $2I$ and $4I$ respectively, as shown in Figure 1. What is the force per unit length acting on wire X?
  • (a)$\frac{\mu_{0} I^2}{\pi r}$
  • (b)$\frac{\mu_{0} I^2}{2\pi r}$
  • (c)$\frac{\mu_{0} I^2}{3\pi r}$
  • (d)Zero
Figure 1
Figure 1

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Moving charges and magnetism

From ISC 2026 Improvement Physics Paper 1, question 1(A)(ii).

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