Electromagnetic Field Theory MCQ Questions & Answers | ECE

A. 25 Ω

B. 50 Ω

C. 225 Ω

D. 250 Ω

A. \[\left. \begin{gathered} \nabla \times H = \frac{{\partial D}}{{\partial t}} \hfill \\ \nabla \times E = \frac{{ - \partial B}}{{\partial t}} \hfill \\ \end{gathered} \right\}\]

B. \[\left. \begin{gathered} \nabla \times E = \frac{{ - \partial B}}{{\partial t}} \hfill \\ \nabla \cdot D = 0 \hfill \\ \end{gathered} \right\}\]

C. \[\left. \begin{gathered} \nabla \cdot D = \rho \hfill \\ \nabla \cdot B = 0 \hfill \\ \end{gathered} \right\}\]

D. \[\left. \begin{gathered} \nabla .B = 0 \hfill \\ \nabla \times H = \frac{{\partial D}}{{\partial t}} \hfill \\ \end{gathered} \right\}\]

A. $$\overrightarrow T = \nabla .\overrightarrow B $$

B. $$\overrightarrow T = \overrightarrow M .\overrightarrow B $$

C. $$\overrightarrow T = \overrightarrow M \times \overrightarrow B $$

D. $$\overrightarrow T = \overrightarrow B \times \overrightarrow M $$

A. 50 ms

B. 135 ms

C. 270 ms

D. None of these

A. $$\frac{{{\sigma ^2}}}{2}$$

B. $$\frac{\sigma }{{2\varepsilon }}$$

C. $$\frac{{{\sigma ^2}}}{{4\pi \varepsilon }}$$

D. $$\frac{{{\sigma ^2}}}{{2\varepsilon }}$$

A. 5.0 m

B. 1.25 m

C. 2.5 m

D. 10.0 m

A. 20.5 µs

B. 22.22 ms

C. 22.22 µs

D. 25.75 µs

A. S₂₁ = -S₁₂

B. S₂₁ = S₁₂

C. S₁₁ = S₁₂

D. S₁₁ = S₂₂

A. -1

B. 1

C. 2

D. 3

A. 1.2 GHz and left circular

B. 4 Hz and left circular

C. 1.2 GHz and right circular

D. 4 GHz and right circular