Discussion :: Materials and Components
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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.
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A.
Both A and R are true and R is correct explanation of A
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B.
Both A and R are true but R is not correct explanation of A
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C.
A is true but R is false
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D.
A is false but R is true
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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.
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