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  • 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. <img src="data:image/png;base64,iVBORw0KGgoAAAANSU

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.

 

 

 

 
 
 
 
 

Answers (1)

The given circuit is a balanced bridge, so there is no current through PR

The circuit is

The equivalent capacitance

C_{eq}=\frac{10\times 20}{10+20}+\frac{5\times 10}{5+10}

        =\frac{20}{3}+\frac{50}{15}

        =\frac{150}{15}=10\; \mu F

When A and B are connected across 10 V, the charge q=CV=10\times 10 \; \mu C

                    = 100 \mu C

Posted by

Safeer PP

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