Assertion : The electrostatic force between the plates of a charged isolated capacitor decreases when dielectric fills whole space between plates.
Reason : The electric field between the plates of a charged isolated capacitance increases when dielectric fills whole space between plates.
AIIMS 2009, Easy
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For isolated capacitor $Q =$ constant, $F =$ constant.
But $E\, = \,\frac{\sigma }{{K\,{ \in _0}}}$, hence $E$ decreases.
$\therefore $ Assertion is incorrect and Reason is correct.
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