The Wheatstone bridge in the circuit is balanced when R3 equals 3000 ohm. If the galvanometer has a resistance of 32 ohm, how much current in microampere will the galvanometer detect, when the bridge is unbalanced by setting R3 to 3003 ohm? Take v = 19 V. (Hint: Find the Thevenin equivalent with respect to the galvanometer terminals when R3 = 3003 ohm. Note that once we have found this Thevenin equivalent, it is easy to find the amount of unbalanced current in the galvanometer branch for different galvanometer movements.)

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