GATE ECE 1993 | Uniform Plane Waves Question 64 | Electromagnetics

GATE ECE 1993

MCQ (Single Correct Answer)

-0.6

A material is described by the following electrical parameters at a frequency of $$10$$ GHz is $$\sigma = {10^6}$$ mho/m, $$\mu = {\mu _0},$$ and $$ \in /{ \in _0} = 10.$$ The material at this frequency is considered to be $$\left( {{ \in _0} = {1 \over {36\,\,\pi }} \times {{10}^{ - 9}}\,\,F/m} \right)$$

a good conductor

a good dielectric

neither a good conductor nor a good dielectric

a good magnetic material

GATE ECE 1991

MCQ (More than One Correct Answer)

-0

The electric field component of a uniform plane electromagnetic wave propagating in the $$Y$$-direction in a lossless medium will satisfy the equation

$${{{\partial ^2}{E_y}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$

$${{{\partial ^2}{E_y}} \over {\partial \,{x^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$

$${{{\partial ^2}{E_x}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_x}} \over {\partial \,{t^2}}}$$

$${{\sqrt {E_x^2 + E_z^2} } \over {\sqrt {H_x^2 + H_z^2} }} = \sqrt {\mu / \in } $$

GATE ECE 1989

MCQ (Single Correct Answer)

-0.6

The skin - depth of copper at a frequency of $$3 GHz$$ is $$1$$ micron ($${{{10}^{ - 6}}}$$ metre). At $$12 GHz$$, for a non - magnetic conductor whose conductivity is $$1/9$$ times that of copper, the skin $$-$$ depth would be

$$\sqrt {9 \times 4} $$ microns

$$\sqrt {9/4} \,\,$$ microns

$$\sqrt {4/9} \,\,$$ microns

$${1 \over {\sqrt {9 \times 4} }}\,$$ microns

GATE ECE 1988

MCQ (Single Correct Answer)

-0.6

In a good conductor the phase relation between the tangential components of electric field E_t and the magnetic field H_t is as follows

E_t and H_t are in phase

E_t and H_t are out of phase

H_t leads E_t by 90⁰

E_t leads H_t by 45⁰