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Two capacitors in parallel are charged, the battery removed and one filled with a dielectric: final potential

The same question, asked 2 times: 2021 Paper 16*, 25 Jul 2022. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2021 Paper 16

    6
    Two capacitor C1C_{1} with capacitor 2C2C, and C2C_{2} with capacitance CC are connected in parallel. They are charged and then the battery is removed. If a material of dielectric constant KK is inserted in C2C_{2}, find final potential across them

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  2. Question 2

    25 Jul 2022

    118
    Two parallel plate capacitors of capacity CC and 3C3C are connected in parallel combination and charged to a potential difference 18 V18\text{ }V. The battery is then disconnected and the space between the plates of the capacitor of capacity CC is completely filled with a material of dielectric constant 9. The final potential difference across the combination of capacitors will be ____\_\_\_\_ VV