11. In a hundred-turn coil, if the flux through each turn is (t3 - 2t) mWb, the magnitude of the induced emf in the coil at a time of 4s is:
12. A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?
13. Skin depth at 2 GHz for a gold conductor with σ = 4.55 × 107 S/m is 1.5 µm. Skin depth (in µm) at 8 GHz & 18 GHz is:
14. The value of ∇.A; where \[A = 3xy{\overrightarrow a _x} + x{\overrightarrow a _y} + xyz{\overrightarrow a _z}\] at a point (2, -2, 2) is:
15. Which one of the following is caused by reflection from stratified atmosphere or from the surface or land conditions along the path?
16. Polarization of dielectric materials results in
17. The property of the material which oppose the creation of magnetic flux in it is called
18. The capacitor is made with a polymeric dielectric having an εr of 2.26 and a dielectric breakdown strength of 50 KV/cm. The permittivity of free space is 8.85 pF/m. If the rectangular plates of the capacitor have a width of 20 cm and a length of 40 cm, then the maximum electric charge in the capacitor is
19. If R = Earth's radius, h = orbit height, β = coverage angle, and θ = minimum elevation angle, then which one of the following relations is correct?
20. The value of the determinant
\[\left| {\begin{array}{*{20}{c}}
{\cos \theta }&\theta &{\sin \theta } \\
0&1&0 \\
{ - \sin \theta }&0&{\cos \theta }
\end{array}} \right|\] is
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