A potentiometer with a cell of 2.4 volt and internal resistance of $2 \Omega$ maintains a potential drop across the resistance wire AB of length 2 meters and resistance $10 \Omega$. A standard cell which maintains a constant emf of 'V' volt with internal resistance $0.2 \Omega$ gives a balance point at 1.6 m length of the wire. The value of emf of second (standard) cell (V) is:

1.6 volt

The correct answer is Option (4) → 1.6 volt