3. The circuit shown consists of a source of variable emf &, an ideal ammeter A

Question

3. The circuit shown consists of a source of variable emf &, an ideal ammeter A an ideal voltmeter V, a resistor of resistance R, and a sample of wire (a) How will the current through the wire sample compare to the current through the resistor R? It is greater through R. It is the same through both. It is greater across R. It is the same across both. Justify your answer. Wire Sample ? (b) How will the potential difference across the wire sample compare to the potential difference across the resistor R? It is greater through R the sample. Justify your answer h rsisane f It is greater across R. It is the same through both. (C) Suppose the wire sample has a resistance of i .00 ?. with the sample of wire in place, the emf of the source is set to a given value. The current through and potential difference across the sample are measured. This is repeated for several values of emf, and the data are recorded in the table below. V source V) VampleV) Lsample (A) 0.250 0.500 0.750 0 1.000 0.179 0.335 0.520 0.670 0.162 0.327 0.490 0.687

Explanation / Answer

3.a) As the wire sample and the resistor R are in series connection then the current flowing them will be equal, and the resistance of the Voltmeter is very high hence a very negligible amount of current will through the voltmeter. Hence it will be same across both of them.

b) We know that V = IR. Hence the voltage acorss R and the wire sample will depend on their indivisual resistances.

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