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Two cylindrical wires P and Q are of equal length and made of the same material - AQA - A-Level Physics - Question 25 - 2019 - Paper 1
Question 25
Two cylindrical wires P and Q are of equal length and made of the same material. The diameter of P is greater than that of Q. P and Q are connected in series and th... show full transcript
Worked Solution & Example Answer:Two cylindrical wires P and Q are of equal length and made of the same material - AQA - A-Level Physics - Question 25 - 2019 - Paper 1
Step 1
Which two quantities are the same for P and Q?
Answer
When two wires are connected in series, several electrical characteristics are shared between them. In this case, the two quantities that are the same for both wires P and Q are:
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Current: Since the same current flows through both wires in a series circuit, they will have the same current.
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Resistivity: Both wires are made of the same material, therefore, they have the same resistivity.
Thus, the correct answer is B: resistivity and C: current.