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March StudentZone Quiz Solution

                     What current must the 1.5V source supply to the circuit?

Start from the right and take the Thevenin equivalent of the 3k, 6k resistors, and the 9V source:

Combine resistors:

Take Thevenin equivalent of 4k, 4k resistors, and 3V source:

Combine resistors:

Now observe that the current is zero.