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Q.

Three long, straight and parallel wires carrying currents are arranged as shown in the figure. The wire C which carries a current of5.0A is so placed that it experiences no force. The distance of wire C from wire D is x centimetre. Then x is.

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a

9 cm

b

7 cm

c

5 cm

d

3 cm

answer is A.

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Detailed Solution

For no force on wire C, force on wire C due to wireD = force on wire C due to wire B⇒μ04π×2×15×5x×1=μ04π×2×5×10(15−x)×t⇒x=9cm
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