Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90Â°. Reason (R): When subjected to ac fields, the dielectric constant can be expressed as âˆˆ'r - jâˆˆ"r.

Assertion (A): In imperfect capacitors, the current does not lead the applied ac voltage by 90°.

Reason (R): When subjected to ac fields, the dielectric constant can be expressed as ∈'r - j∈"r.

[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:

Imaginary part of ∈r gives rise to absorption of energy by the material from alternating field.

Hence current does not lead the voltage by 90°.