A resistance of \[4\,\Omega \] and a wire of length 5 metres and resistance \[5\,\Omega \] are joined in series and connected to a cell of e.m.f. 10 V and internal resistance \[1\,\Omega \]. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is [MP PMT 1997]

• A.                                                      1.5 V
• B.                    3.0 V
• C.                    0.67 V
• D.                    1.33 V