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Three capacitors C1, C2 and C3 whose values are 1 μF, 5 μF and 2 μF respectively, have breakdown voltages of 10 V, 5 V, and 2 V respectively. For the interconnection shown below, the maximum safe voltage in V that can be applied across the combination, and the corresponding total charge in μC stored in the effective capacitance across the terminals are respectively.

1. 2.8 and 36
2. 7 and 119
3. 2.8 and 32
4. 7 and 80

Correct answer: 2.8 and 36

Solution

The maximum safe voltage is determined by the capacitor with the lowest breakdown voltage in the series, which is C3 at 2V. In this configuration, the effective capacitance is calculated, and the total charge stored can be derived from the voltage and capacitance values, leading to the correct answer of 2.8 V and 36 μC.

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