Correct Answer: Option C

Explanation

¹/_R = ¹/₈ + ¹/₈ = ²/₈
∴ R = 4Ω
^l/_l1 = ^R/_R1
(x)/(100-x) = 4/8
4(100-x) = 8x
400-4x = 8x
400 = 8x + 4x = 12x
x = 400/12 = 33.3cm

There is an explanation video available below.

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