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EMF, E = K where K = V/L potential gradient.

1. K = V/L
2. K = IR/L
3. K = (E₀f/(r + r₁))L
4. K = E₀f/L

Correct answer: K = V/L

Solution

The potential gradient (K) is defined as the potential difference (V) per unit length (L), so K = V/L is the correct expression.

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