The book said that the brightness of R1 would increase and R2 would decrease. I don't understand this at all.
Why does adding a wire from b to c change anything to R1?
Shouldn't charge still flow through R1 as they should and R2's brightness decrease because the charges at point b have an alternate route to travel to point 2?
Answer
The voltage drop across R2 becomes 0, and the full voltage is applied across R1 instead.
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