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The e.m.f. E will be given by:

1. E₀f / (r + r₁) · l / L
2. E₀f / L
3. LE₀f / (r + r₁)l
4. LE₀f / r₁

Correct answer: E₀f / (r + r₁) · l / L

Solution

The given formula for e.m.f. involves terms like E₀, f, r, r₁, l, and L. Based on dimensional consistency and the structure of the options, option A is correct as it aligns with the expected relationship for e.m.f. in such a system.

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