Materials and Components - Engineering

Q1:

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

A halved

B kept the same

C doubled

D made 4 times

ANS:A - halved

. When dimensions are changed, A become four times and d becomes twice. Since ∈0 is constant, ∈r must be halved to keep C constant.