Question: 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

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? (c) the brightness of bulb 2? Explain your answers conceptually (not just with formulas)

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