Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A soft, electrically-conducting cylindrical sample has resistance $R$. It is rolled out so that its length becomes twice as great, while its volume remains constant. What is its new resistance?

  • A$\frac{R}{2}$
  • B$R$
  • C$2R$
  • D$4R$

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