Assertion (A): In a perfect capacitor, the current density is given by ω ∈0E0∈'rcos(ωt + 90°), where ∈r' is real part of dielectric constant. Reason (R): In a perfect capacitor, dielectric losses are zero.

Assertion (A): In a perfect capacitor, the current density is given by ω ∈0E0∈'rcos(ωt + 90°), where ∈r' is real part of dielectric constant.

Reason (R): In a perfect capacitor, dielectric losses are zero.

[A].	Both A and R are true and R is correct explanation of A
[B].	Both A and R are true but R is not correct explanation of A
[C].	A is true but R is false
[D].	A is false but R is true

Answer: Option A

Explanation:

If dielectric losses are zero, the current in capacitor leads the applied voltage by 90°.

Also imaginary part of is ∈_r is zero.