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(C) The charge stored on the two plates of a capacitor are $+Q$ and $-Q$. The total charge is $Q + (-Q) = 0$. Thus,the Assertion is correct.The electr

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If Assertion is correct but Reason is incorrect.

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(C) The charge stored on the two plates of a capacitor are $+Q$ and $-Q$. The total charge is $Q + (-Q) = 0$. Thus,the Assertion is correct.The electric field outside a parallel plate capacitor is zero because the fields produced by the two plates (each of magnitude $\frac{\sigma}{2\varepsilon_0}$) are equal and opposite. The field between the plates is $\frac{\sigma}{\varepsilon_0}$.As shown in the figure,by drawing a Gaussian surface $ABCD$,we can apply Gauss's Law: $\oint \vec{E} \cdot d\vec{s} = \frac{q_{enclosed}}{\varepsilon_0}$. Since the net charge enclosed by the surface is $Q - Q = 0$,the net flux is zero,which implies the electric field outside the plates is zero. Therefore,the Reason is incorrect.

Assertion : The total charge stored in a capacitor is zero.
Reason : The field just outside the capacitor is $\frac{\sigma }{{{\varepsilon _0}}}$. ( $\sigma $ is the charge density).

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Assertion : The total charge stored in a capacitor is zero.Reason : The field just outside the capacitor is $\frac{\sigma }{{{\varepsilon _0}}}$. ( $\sigma $ is the charge density).