(C) For an isolated capacitor,the charge $Q$ remains constant.The force $F$ between the plates is given by $F = \frac{Q^2}{2A\epsilon_0 K}$. Since $K

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If Assertion is correct but Reason is incorrect.

(C) For an isolated capacitor,the charge $Q$ remains constant.The force $F$ between the plates is given by $F = \frac{Q^2}{2A\epsilon_0 K}$. Since $K > 1$ for a dielectric,the force $F$ decreases.Thus,the Assertion is correct.The electric field $E$ between the plates is given by $E = \frac{\sigma}{K\epsilon_0} = \frac{E_0}{K}$. Since $K > 1$,the electric field $E$ decreases.Therefore,the Reason is incorrect.Hence,the correct option is $C$.

Class 12 Physics Electric Potential and Capacitance Effect of Dielectric Inside Capacitor

Easy

Assertion: The electrostatic force between the plates of a charged isolated capacitor decreases when a dielectric fills the whole space between the plates.
Reason: The electric field between the plates of a charged isolated capacitor increases when a dielectric fills the whole space between the plates.

AIIMS 2009 All AIIMS

A
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
B
If both Assertion and Reason are correct,but Reason is not the correct explanation of Assertion.
C
If Assertion is correct but Reason is incorrect.
D
If Assertion is incorrect and Reason is correct.