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in Magnetic effects of current and magnetism by (35 points)
4. A infinitely long straight current carrying wire carries current of \( 2 A \) in it. Just above the wire, there is a thin rod hinged to the wire. The rod is perpendicular to the wire. The rod has mass of \( \frac{1}{4} kg \), length of \( 40 cm \) and carries a current of \( 1 A \). Neglect gravity. The hinge is at the center of the rod. Find the initial angular acceleration of the rod. (A) \( 1.2 \times 10^{-5} rad / s ^{2} \) (B) \( 3.6 \times 10^{-5} rad / s ^{2} \) (C) \( 2.4 \times 10^{-5} rad / s ^{2} \) (D) \( 4.8 \times 10^{-5} rad / s ^{2} \)

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