Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

A copper wire is shaped as a cylinder and has resistance $R$. What is the resistance of a copper wire with twice the length and twice the radius?

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

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