(Practical Voltmeter) The exact potential difference across two points can be measured by parallelly connecting an ideal voltmeter to it. An ideal voltmeter has infinite resistance, which in practice is replaced by a voltmeter with very high resistance. However, the notion of high resistance is relative, and the existence of a finite-resistance voltmeter can change the whole circuit. You will be able to see the effect of adding a voltmeter in this problem. Suppose the resistance of the voltmeter used is 10k2. Vo R1 R2 (a) Suppose the two resistors have the same resistance R1 = R2 = 5Q. Calculate the potential difference across R1. (b) Now suppose R1 R2 = 5kN. Calculate again the potential difference across R1. (c) If the voltmeter has infinite resistance, i.e. ideal resistance, what value do you expect the answer of part (a) and (b) should be?

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Combination of Capacitors

The connection of capacitors can be established in a circuit in two ways.