Question 22a cell needed 0.30m of the wire of a potentiometer to balance its e.m.f, but only 2.0m of its s.p.d. when a resistance of 4Ω was connected across its terminals. calculate the internal resistance of the cell.A.1.0ΩB.0.5ΩC.1.5ΩD.2.0ΩObjective Show full explanation