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Three straight, parallel wires are coplanar and perpendicular to the plane of the page. The…

Physics20261 markMCQ

Three straight, parallel wires are coplanar and perpendicular to the plane of the page. The currents $I_1$ and $I_3$ are directed out of the page. If wire 3 experiences no force due to the currents $I_1$ and $I_2$, then the current in the wire 2 is: (Analysis)

(a)$I_2 = 2I_1$ and directed into the page
(b)$I_2 = 0.5I_1$ and directed into the page
(c)$I_2 = 2I_1$ and directed out of the page
(d)$I_2 = 0.5I_1$ and directed out of the page

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Moving charges and magnetism

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