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Three long parallel wires \( A B, C D \) and \( E F \) of equal resistance are connected as shown in Fig. \( 4(\mathrm{Q}) \).46. The separation between the neighbouring wires is \( 2.0 \mathrm{~cm} \) and wires \( A E \) and \( B F \) are of negligible resistance. The current is supplied to the wires and ammeter reads \( 12 \mathrm{~A} \). Find the magnetic force per unit length
of wire \( C D \).
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