Assertion (A): In a perfect capacitor, the current density is given by ? ?0E0?'r

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Question
Assertion (A): In a perfect capacitor, the current density is given by ? ?₀E₀?^'_rcos(?t + 90�), where ?_r^' is real part of dielectric constant.
Reason (R): In a perfect capacitor, dielectric losses are zero.
Options
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

Correct Answer

Both A and R are true and R is correct explanation of 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.