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Question 21

A stepped heating element consists of two uniform cylindrical sections, P and Q, made from the same material and joined in series. The sections have equal lengths. The diameter of P is four times the diameter of Q, and the resistance of P is RRR.

What is the total electrical resistance of the entire stepped heating element?

A

1716R\frac{17}{16}R1617​R

B

5R5R5R

C

16R16R16R

D

17R17R17R

Markscheme

Current electricity Questions

  1. A Level
  2. /Physics
  3. /Current electricity

36 exam-style questions on AQA A Level Physics Current electricity, covering Basics of electricity, Current-voltage characteristics, Resistivity, Circuits, Potential divider, and Electromotive force and internal resistance. Each one has a worked solution and a mark scheme showing where the marks go.

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