A parallel plate capacitor has its length, width and separation doubled. It fringing effects are neglected, to keep the capacitance same, the dielectric constant must be

Electronics and Communication Engineering (ECE) : Materials and Components - Quiz(MCQ)

doubled

kept the same

halved

made 4 times

Correct Answer : Option (C) : halved

Explanation : C= ∈0∈A/d When dimensions are changed, A become four times and d becomes twice.

Since ∈0 is constant, ∈r must be halved to keep C constant.

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Magnetic hysteresis phenomenon is explained by

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motion of domain walls and domain rotation

None of the above

Correct Answer : motion of domain walls and domain rotation