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- Nov 15, 2014

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So the answer is A, and the explanation is shown here. Now I get why increasing L by a factor of 2 will decrease the electric field (via formula E = V/L), but

__I don't get why decreasing R by a factor of 2 does not have the same effect.__My rationale is: via V = IR, if you hold current constant decreasing R by a factor of 2 would decrease V by a factor of 2. If V decreases by a factor of 2, E would also decrease by a factor of 2.

So, where did the AAMC solution get the formula E = (V - IR)/L from? What error am I making in my reasoning?

Thanks!