Question: 4. (This one is hard, but very important.) When circuit 2 is transformed into circuit 4 (by hooking up the third bulb), what happens to

4. (This one is hard, but very important.) When circuit 2 is transformed into circuit 4 (by hooking up the third bulb), what happens to (a) The current through wire A? (b) The brightness of bulb 1

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