AP® Physics C: E & M

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Resistor in a Circuit


A student while working on the experiment connects a metal rod/resistor in a simple circuit shown below and records the ammeter and voltmeter readings for this experiment.

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She then replaces the rod used in the initial experiment with another rod of the same material. This new rod is twice as long as the original rod and its diameter is double the diameter of the original rod.

Which statement accurately describes the changes observed by the student (assume an ideal battery with no internal resistance)? Select ALL that apply.


The ammeter reading will remain the same.


The voltmeter reading will remain the same.


The ammeter reading will increase.


The voltmeter reading will increase.


The ammeter reading will decrease.