**Cell constant** of a conductivity cell is given by:
A$\Lambda \cdot c$
B$l/a$ (separation/area)
C$R/\kappa$
D$\kappa \cdot R$
Answer & Solution
Correct answer: B. $l/a$ (separation/area)
Cell constant $= l/a$ — has SI units m⁻¹ (commonly cm⁻¹). Once known (typically calibrated with KCl), gives $\kappa = \text{cell constant}/R$.
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