1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field of a plane electromagnetic wave is given by $$B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]$$. Average energy density corresponding to the electric field is

A
$$8 \times 10^{-3} \mathrm{Jm}^{-3}$$
B
$$31.8 \times 10^{-3} \mathrm{Jm}^{-3}$$
C
$$80 \times 10^{-3} \mathrm{Jm}^{-3}$$
D
$$3.18 \times 10^{-3} \mathrm{Jm}^{-3}$$
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

In an amplitude modulated signal, the maximum amplitude is $$15 \mathrm{~V}$$ and minimum amplitude is $$5 \mathrm{~V}$$. The amplitude of modulating wave will be

A
5 V
B
10 V
C
20 V
D
30 V
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