Physics (AS & A Level) · Oct / Nov 2022 · Paper 53 · Question 2
9702
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The question as text
A student investigates a circuit containing resistors and a metal wire as shown in Fig. 2.1. V L Z P Q Y metal wire crocodile clips Fig. 2.1 Resistors Y and Z have resistances Y and Z respectively. The student connects a resistor of resistance R between P and Q. The student then adjusts the length of the wire between the crocodile clips until the voltmeter reads zero. The student measures the length L of wire between the crocodile clips. The student repeats the experiment with different values of R. It is suggested that L and R are related by the equation Z R = 4ρL πYd 2 where d is the diameter of the wire and ρ is the resistivity of the metal. 1
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