In the figure shows a potentiometer with a cell of 2.0 V and internal resistance 4.0Ω maintaining a potential drop across the resistor wire AB. A standard cell which maintains a constant e.m.f E₁ = 1.02 V (for very moderate currents up to a few ampere) gives a balance point at 67.3 cm length of the wire. To ensure very low currents drawn from the standard cell, a very high resistance of  600 kΩ is put in series with it, which is shortest close to the balance point. The standard cell is then replaced by a cell of  unknown e.m.f. E₂and the balance point found similarly turns out to be at 82.3 cm length of the wire.
(i) What is the value of E₂?