Three capacitors, $3 μ F, 6 μ F$ and $6 μ F$ are connected in series to a source of 120V. The potential difference, in volts, across the $3 μ F$ capacitor will be

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Solution

The correct option is D 60
The equivalent capacitance of the two $6 μ F$ and $6 μ F$ capacitors in series is $3 μ F$ .
Hence the potential across the two capacitors, original $3 μ F$ capacitor and the equivalent $3 μ F$ capacitor is divided equally.
Hence voltage across each of the capacitors is half of the external applied voltage, $60 V .$

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Three capacitors, 3μF,6μF and 6μF are connected in series to a source of 120V. The potential difference, in volts, across the 3μF capacitor will be

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