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Electromagnetic Field Theory - Engineering

Q1:

A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is

A 45 MHz

B 90 MHz

C 450 MHz

D 900 MHz

ANS:A - 45 MHz

Conduction current density J = wD J = σE σE = ωD = 2p fD