Ch $26$

Problem $1$: Consider the circuit shown. All wires are considered ideal; that is$,$ they have zero resistance. We will assume for now that all other elements of the circuit are ideal, too: The value of resistance R is a constant, the internal resistances of the battery $($ rint$)$ and the ammeter $($ rA$)$ are zero, and the internal resistance of the voltmeter $($ rV$)$ is infinitely large. $($Figure $1)$

Part G: What is the new reading of the ammeter?

Express your answer in terms listed in the picture.

$**$ Now assume that the ammeter again has zero resistance, but the resistance of the voltmeter is less than infinity. The battery still has nonzero internal resistance.

Part H: Compared to their values when $\backslash ($ r V$=\backslash$infty $\backslash ),$ how would the readings of the ammeter and the voltmeter change when $\backslash ($ r V $\backslash )$ is some large but finite value?

Answer choices $($select one$)$:

The voltmeter reading would stay the same; the ammeter reading would increase.

The voltmeter reading would stay the same; the ammeter reading would decrease.

The voltmeter reading would decrease; the ammeter reading would decrease.

The voltmeter reading would increase; the ammeter reading would increase.

Suppose now that the piece of ideal wire between points $1$ and $2$ is removed and replaced by a nonideal wire with a nonzero resistance.

Part I: How would this change affect the readings of the ammeter and the voltmeter?

Answer choices $($select one$)$:

The ammeter reading would stay the same; the voltmeter reading would stay the same.

The ammeter reading would decrease; the voltmeter reading would decrease.

The ammeter reading would increase; the voltmeter reading would decrease.

The ammeter reading would decrease; the voltmeter reading would increase.

The ammeter reading would increase; the voltmeter reading would increase.

The ammeter reading would stay the same; the voltmeter reading would increase.