When a dielectric is placed in an electric field, the electric flux density D, electric field intensity E and polarization P are related as
A. $$\overline {\text{D}} = {\varepsilon _0}\overline {\text{E}} \times {\text{P}}$$
B. $$\overline {\text{D}} = {\varepsilon _0}\overline {\text{E}} - {\text{P}}$$
C. $$\overline {\text{D}} = {\varepsilon _0}\left( {\overline {\text{E}} \times {\text{P}}} \right)$$
D. $$\overline {\text{D}} = {\varepsilon _0}\overline {\text{E}} + {\text{P}}$$
Answer: Option D
A loop antenna is a commonly used for
A. Radar
B. Direction finding
C. Satellite communication
D. All of the above
The divergence of a vector is a scalar, while the curl of a vector is another
A. Scalar
B. Vector
C. Unit vector
D. None of the above
Which antenna is a wideband antenna?
A. Hertz antenna
B. Marconi antenna
C. Folded dipole
D. None of the above
A. Accelerating
B. Retardation
C. Oscillating
D. Lagging the current

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