**1)**

Kirchhoff's loop rule:

$\overline{){\mathbf{\Sigma}}{\mathbf{V}}{\mathbf{=}}{\mathbf{0}}}$

$\begin{array}{rcl}\mathbf{\epsilon}\mathbf{-}\mathbf{ir}\mathbf{-}{\mathbf{iR}}_{\mathbf{v}}& \mathbf{=}& \mathbf{0}\end{array}$

i = V_{meter}/R_{v}

Unlike the idealized voltmeter, a real voltmeter has a resistance that is not infinitely large.**(a)** A voltmeter with resistance R_{v} is connected across the terminals of a battery of emf "EMF" and internal resistance r. Find the potential difference V_{meter} measured by the voltmeter.**(b)** If emf = 7.50 v and r = 0.45 Ω, find the minimum value of the voltmeter resistance R_{v} for which the voltmeter reading is within 1.0% of the emf of the battery.

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