Correct Answer: Option D

Explanation

From Ohms Law, E = I(R +X)
=> E = I₁(R₁ + X)
again, E = I₂(R₂ + X)
=> I₁(R₁ + X) = I₂(R₂ + X)
∴ 5(8 + X) = 7(5 + X)
40 + 5X = 35 + 7X
7X - 5X = 40 - 35
2X = 5
X = ⁵/₂
= 2.5Ω

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