Physics 9702 · AS & A Level · Resistance and resistivity

Resistance and resistivity — practice question

Wires S and T are two copper wires of the same length and are joined in parallel. The diameter of wire S is $3.0\,\text{mm}$. The diameter of wire T is $1.5\,\text{mm}$. A potential difference is applied across the two ends of this parallel combination. What is the value of the ratio $\frac{\text{current in S}}{\text{current in T}}$?

  • A$\frac{1}{4}$
  • B$\frac{1}{2}$
  • C$2$
  • D$4$

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