The resistances of sections AB, BC and AD are respectively 1000, 500 and 200 Ohms. A galvanic cell, the poles of which are connected to points L and C, has an emf of 1.8 V. The galvanometer registers a current of 0.5 mA in the direction indicated by the arrow. Determine the emf of the second galvanic element, neglecting the internal resistances of the elements and the internal resistance of the galvanometer.
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