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  4. A parallel plate capacitor is charged from a cell then it is disconnected from the cell. Now, the separation between its plates is increased then the force of attraction between the plates:

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Q. A parallel plate capacitor is charged from a cell then it is disconnected from the cell. Now, the separation between its plates is increased then the force of attraction between the plates:

NTA AbhyasNTA Abhyas 2022

Solution:

Since the capacitor is isolated, charge on it will not change.
Force on its plate, $F=\frac{q^{2}}{2 \epsilon _{0} A},$ will not change.