68. The electrical circuit shown in Fig .. There R1 = 100 Ohms, R2 = 50 ohms, R3 = 20 ohms, EMF element ε1 = 2 V. A galvanometer is current I3 = 50 mA in the direction indicated by the arrow. Determine EMF ε2. Galvanometer resistance and internal resistance of the cell neglected.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)