Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): When a dielectric slab ( K > 1 ) of thickness t Reason (R): For an isolated charged capacitor, the electric field in the air gap between the plates remains unchanged upon the introduction of the dielectric slab. In the light of the above statements, choose the most appropriate answer from the optio

Step-by-step solution

For an isolated charged capacitor, the charge Q on the plates remains constant. The electric field in the air gap is E₀ = Q A ₀ , which remains unchanged since Q is constant. Thus, the Reason is true. Inside the dielectric slab, the electric field is reduced to E = E₀ K . The new potential difference between the plates is V = E₀(d-t) + E₀ K t . Since K > 1 , the new potential difference V is less than the original potential difference V₀ = E₀ d . Thus, the Assertion is true. However, the decrease in potential diffe