Physics 0625 · IGCSE · Electrical quantities

Electrical quantities — practice question

Two wires $X$ and $Y$ are made of the same metal and have equal resistance. Which row shows a possible set of values for $X$ and for $Y$?

  • Alength of $X$: $50\,\text{cm}$, diameter of $X$: $0.40\,\text{mm}$; length of $Y$: $200\,\text{cm}$, diameter of $Y$: $0.10\,\text{mm}$
  • Blength of $X$: $50\,\text{cm}$, diameter of $X$: $0.40\,\text{mm}$; length of $Y$: $200\,\text{cm}$, diameter of $Y$: $0.20\,\text{mm}$
  • Clength of $X$: $50\,\text{cm}$, diameter of $X$: $0.40\,\text{mm}$; length of $Y$: $200\,\text{cm}$, diameter of $Y$: $0.80\,\text{mm}$
  • Dlength of $X$: $50\,\text{cm}$, diameter of $X$: $0.40\,\text{mm}$; length of $Y$: $200\,\text{cm}$, diameter of $Y$: $1.60\,\text{mm}$

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