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Q.

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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a

196 A in opposite direction

b

14 A in same direction

c

196 A in same direction

d

14 A in opposite direction

answer is B.

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Detailed Solution

Tcosθ=mg,Tsinθ=F,F=mgTanθ

μ0(i)(i)2πrl=mgTanθi=14A

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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