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Two parallel horizontal conductors are suspended by light vertical threads each of length 75 cm .Each conductor has a mass of 40gm per m. When no current flows through them, they are 0.5 cm apart. When same current flows through each conductor the separation is 1.5cm. The value of direction of current is

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196 A in opposite direction

14 A in same direction

196 A in same direction

14 A in opposite direction

answer is B.

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Detailed Solution

$Tcos θ = mg, Tsin θ = F, F = mgTan θ$

$\frac{μ_{0} (i) (i)}{2 πr} l = mgTan θ \Rightarrow i = 14 A$

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