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(a) A voltmeter with resistance Rv is co...

(a) A voltmeter with resistance `R_v` is connected across the terminals of a battery of emf `E` and internal resistance `r`. Find the potential difference measured by the voltmeter.
(b) If` E = 7.50 V` and `r = 0.45 Omega`, find the minimum value of the voltmeter resistance `R_v` so that the voltmeter reading is within `1.0%` of the emf of the battery. (c) Explain why your answer in part (b) represents a minimum value.

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