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Q.

The following arrangement consists two infinitely long uniformly charged rods and a semicircular rod. The linear charge density of each part is the same and equal to $' λ'$ (Take $λ = 1 C/m & a = 1 cm$ )

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Detailed Solution

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Force between charges $F = \frac{k q^{2}}{r^{2}} = 4 \times 10^{- 3} N$
Also $T \sin θ = F$
$Tension T = \frac{F}{\sin θ} = \frac{4 \times 10^{- 3}}{(\frac{1}{20})} = 8 \times 10^{- 2} N$

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