Question

Calculate the equivalent capacitance between points A and B in the circuit below. If a battery of 10 V is connected across A and B, calculate the charge drawn from the battery by the circuit.

\(\therefore\quad\cfrac{C_1}{C_2}=\cfrac{C_3}{C_4}\)

Answer 1

This is the condition of balance so there will be no current across PR (50 µF capacitor)

Now C₁ and C₂ are in series

Equivalent capacitance between A and B is

Hence, charge drawn from battery (Q) = CV

= 10 × 10 µC = 100 µC = 10^–4 C