Physics 9702 · AS & A Level · Potential dividers

Potential dividers — practice question

In the circuit diagram, the ammeter shows a reading of zero. The four resistors have different resistances $R_1$, $R_2$, $R_3$ and $R_4$. Which equation is correct?

  • A$R_1 - R_3 = R_2 - R_4$
  • B$R_1 \times R_3 = R_2 \times R_4$
  • C$R_1 - R_4 = R_2 - R_3$
  • D$R_1 \times R_4 = R_2 \times R_3$

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