AP EAPCET 2022 - 5th July Morning Shift | Electromagnetic Waves Question 1 | Physics

The magnetic field in a plane electromagnetic wave is given as $$\mathbf{B}=\left(3 \times 10^{-7} \mathrm{~T}\right) \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{j}$$

The electric field of this wave is given as

$$90 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{i} \mathrm{~Vm}^{-1}$$

$$90 \sin \left(3 \times 10^4 \mathrm{x}+9 \times 10^{12} t\right) \hat{\mathrm{k}} \mathrm{~Vm}^{-1}$$

$$45 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{i} \mathrm{~Vm}^{-1}$$

$$45 \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{k} \mathrm{~Vm}^{-1}$$

AP EAPCET 2022 - 5th July Morning Shift

MCQ (Single Correct Answer)

-0

Frequencies in the UHF range normally propagate by means of

Space waves

Surface waves

Ground waves

Sky waves

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

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A light of intensity $$12 \mathrm{Wm}^{-2}$$ incidents on a black surface of area $$4 \mathrm{~cm}^2$$. The radiation pressure on the surface is

$$1 \times 10^{-8} \mathrm{~Pa}$$

$$4 \times 10^{-8} \mathrm{~Pa}$$

$$1.6 \times 10^{-7} \mathrm{~Pa}$$

$$4.8 \times 10^{-7} \mathrm{~Pa}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

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The electric field $$(E)$$ and magnetic field $$(B)$$ of an electromagnetic wave passing through vacuum are given by

$$\begin{aligned} & E=E_0 \sin (k x-\omega t) \\ & B=B_0 \sin (k x-\omega t) \end{aligned}$$

Then the correct statement among the following is

$$E_0 k=B_0 \omega$$

$$E_0 \omega=B_0 k$$

$$E_0 B_0=\omega k$$

$$E_0 B_0=\frac{\omega}{k}$$

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